https://wiki.haskell.org/api.php?action=feedcontributions&user=Emk&feedformat=atomHaskellWiki - User contributions [en]2020-08-06T20:32:01ZUser contributionsMediaWiki 1.27.4https://wiki.haskell.org/index.php?title=Hoogle&diff=22728Hoogle2008-09-02T01:28:34Z<p>Emk: Button label fix</p>
<hr />
<div>Hoogle is a Haskell API search engine, which allows you to search many standard Haskell libraries by either function name, or by approximate type signature.<br />
<br />
* '''Online version:''' http://haskell.org/hoogle<br />
* '''Hackage page:''' http://hackage.haskell.org/cgi-bin/hackage-scripts/package/hoogle<br />
* '''Darcs repository:''' http://code.haskell.org/hoogle<br />
* '''Bug tracker:''' http://code.google.com/p/ndmitchell/issues/list<br />
* '''Manual:''' This page.<br />
<br />
== Hoogle Use ==<br />
<br />
Hoogle can be used in several ways:<br />
<br />
* Online, with the web interface: http://haskell.org/hoogle<br />
* In the [[IRC channel|Haskell IRC channel]], using the [[Lambdabot]] plugin, <tt>@hoogle</tt> and <tt>@hoogle+</tt><br />
* With the command line version [http://hackage.haskell.org/cgi-bin/hackage-scripts/package/hoogle available on Hackage].<br />
<br />
This section describes Hoogle searches, and the flags available from the Hoogle command line tool. The information applies only to Hoogle 4, the next version of Hoogle, and is still being fleshed out.<br />
<br />
=== Searches ===<br />
<br />
Before explaining the syntax of searches, we first give a list of example searches with their meaning:<br />
<br />
* "map" Search for the text "map"<br />
* "con map" Search for the text "map" and the text "con"<br />
* "a -> a" Search for the type "a -> a"<br />
* ":: a -> a" Search for the type "a -> a"<br />
* "a" Search for the text "a"<br />
* ":: a" Search for the type "a"<br />
* "id :: a -> a" Search for the text "id" and the type "a -> a"<br />
<br />
Searches can be either textual (a list of words), or by type (a type signature) or both. A type search may optionally start with a "::" symbol. A search is considered a text search unless it contains a combination of text and symbols, or if it starts with (::). To search for both a type and a name, place a :: between them, for example "undefined :: a"<br />
<br />
Searches can be restricted to a particular module with +Module.Name, or to avoid a module with -Module.Name. The command Module.Name.Foo is treated as +Module.Name Foo.<br />
<br />
Searches can be restricted to a particular package with +packagename, or to avoid a package with -package. By default Hoogle will search a standard set of packages.<br />
<br />
==== Command Line Search Flags ====<br />
<br />
Flags can be specified as <tt>--flag</tt> or <tt>/flag</tt>. Flags requiring arguments are specified as <tt>--flag=arg</tt> or <tt>/flag=arg</tt>. Anything which is not a flag is counted as a search query. Because a console will treat <tt>-></tt> as a redirection, you can do <tt>-#</tt> to get the right character.<br />
<br />
* <tt>--version</tt> Print out version information<br />
* <tt>--help</tt> Show help on the command line flags<br />
* <tt>--include=dir</tt> Specify which directories are searched for necessary files, defaults to "." and the data directory configured with Cabal.<br />
* <tt>--color</tt> Show color output, requires an ANSI compliant terminal, defaults to false<br />
* <tt>--count=int</tt> Maximum number of results to print, defaults to showing all results<br />
* <tt>--start=int</tt> 1-based index of first result to print, defaults to 1<br />
* <tt>--info</tt> Show extended information for the first results<br />
<br />
=== Database Creation ===<br />
<br />
Hoogle has both binary databases (extension .hoo) and textual databases (extension .txt). Textual database files are a list of functions and their types, along with information about type synonyms, instances etc. The textual database files can be generated by [http://haskell.org/haddock/ Haddock] with the <tt>--hoogle</tt> flag. Support for this is now in [http://haskell.org/cabal/ Cabal] with <tt>runhaskell Setup haddock --hoogle</tt>.<br />
<br />
A more detailed tutorial style style post on database creation is available [http://neilmitchell.blogspot.com/2008/08/hoogle-database-generation.html on the author's blog].<br />
<br />
==== Converting text databases to binary databases ====<br />
<br />
A text database can be converted to a binary database with the command <tt>hoogle --convert=file.txt</tt>. Any package dependencies should be specified with <tt>+package</tt> or <tt>--data=package.hoo</tt>, and will require the binary databases for those packages. The output file can be controlled with <tt>--output=file.hoo</tt>.<br />
<br />
==== Merging binary databases ====<br />
<br />
Multiple binary databases can be merged with <tt>hoogle --combine=file1.hoo --combine=file2.hoo</tt>. As before, <tt>--output=default.hoo</tt> can be specified.<br />
<br />
==== Scope of Web Searches ====<br />
<br />
Using the standard web interface, Hoogle searches: array, arrows, base, bytestring, Cabal, cgi, containers, directory, filepath, haskell-src, HUnit, mtl, old-locale, old-time, packedstring, parallel, parsec, pretty, process, QuickCheck, random, stm, template-haskell, time, xhtml.<br />
<br />
Using the [http://haskell.org/hoogle/3/?package=gtk Gtk2hs Hoogle], Hoogle searches only in the Gtk2hs package.<br />
<br />
=== Developer Flags ===<br />
<br />
,f (ArgNone Web) ["w","web"] [PCmdLine] "Run as though it was a CGI script"<br />
,f (ArgNone Test) ["test"] [PCmdLine] "Run the regression tests"<br />
,f (ArgStr Dump) ["dump"] [PCmdLine] "Dump a database for debugging"<br />
,f (ArgFileIn DataFile ["hoo"]) ["d","data"] [PCmdLine,PMultiple] "Database file"<br />
,f (ArgNone Verbose) ["v","verbose"] [PCmdLine] "Display verbose information"<br />
,f (ArgNone Debug) ["debug"] [PCmdLine] "Debugging only"<br />
,f (ArgFileIn TestFile ["txt"]) ["testfile"] [PCmdLine,PMultiple] "Run tests from a file"<br />
,f (ArgFileIn Rank ["txt"]) ["rank"] [PCmdLine,PMultiple] "Generate ranking scores"<br />
<br />
== Hoogle Integration Modes ==<br />
<br />
Hoogle can be integrated with various programs, listed below. Most of these integration modes were contributed by users, and users are encouraged to add more programs to this list.<br />
<br />
=== Firefox Integration ===<br />
<br />
'''From the search bar:''' Go to the [http://haskell.org/hoogle/ Hoogle website] in Firefox and click on "Search plugin", top right hand corner. This will add a Hoogle entry to the search box in Firefox.<br />
<br />
'''As a keyword search:''' You can set up Hoogle as a keyword search in Firefox. This means that you can type <tt>h map</tt> directly into the location bar and you'll jump directly to the Hoogle search results page.<br />
<br />
# Visit Hoogle's web interface: http://haskell.org/hoogle<br />
# Right-click on the text input box and click "Add a Keyword for this Search..."<br />
# Give it a nice short keyword like "h".<br />
<br />
If you want to also search for special symbols in Firefox keyword search, modify the keyword serach URL to be: <tt>javascript:window.location.href="http://haskell.org/hoogle?q=" + encodeURIComponent("%s")</tt><br />
<br />
=== GHCi Integration ===<br />
<br />
Ever feel like having access to hoogle whilst messing around in GHCi? It's relatively easy to integrate the two. I'm on linux, so I don't know how well the following will work if you're on windows.<br />
<br />
First, you need to download and compile Hoogle. Then, we want to move hoogle to somewhere in your system's <code>$PATH</code> (open a terminal and type <code>echo $PATH</code> to see where this is). I suggest ~/bin, although you might want to go for /usr/bin or /usr/local/bin, etc.<br />
<br />
Copy the Hoogle binary and hoogle.txt to the directory you chose. If you're using a version of hoogle pulled straight from darcs, you can ignore everything up until the 'Next, we need to integrate it into GHCi' bit. Otherwise:<br />
<br />
There's a problem in that hoogle doesn't look for hoogle.txt in the system <code>$PATH</code>, it only looks in the current directory. This is a slight pain but is easily worked around: rename the hoogle binary to hoogle-bin, then create a new text file called 'hoogle' with the following contents:<br />
<br />
#! /bin/bash<br />
hoogle-bin -l /path/to/your/chosen/directory/hoogle.txt "$@"<br />
<br />
chmod hoogle to make it executable (try <code>chmod +x hoogle</code>). Now you should be able to run hoogle requests from the shell. Try a few of the examples above.<br />
<br />
Next, we need to integrate it into GHCi. We can execute shell commands with GHCi via <code>:def</code>. Load up GHCi, and type the following:<br />
<br />
:def hoogle \x -> return $ ":!hoogle " ++ x<br />
<br />
If this executes cleanly, you should be able to run hoogle commands from GHCi via <code>:hoogle</code>, i.e. <code>:hoogle map</code> or <code>:hoogle "(a -> b) -> [a] -> [b]"</code>. Be careful: you need the extra quotes when hoogling types, at least on my system. <code>:ho</code> works as an abbreviation of <code>:hoogle</code> (just <code>:h</code> clashes with <code>:help</code>).<br />
<br />
Finally, we want to make this persist across GHCi sessions. GHCi loads a file called ~/.ghci before running, so simply stick the above <code>:def</code> in that file and all should work.<br />
<br />
Contributed by [[User:DavidHouse|DavidHouse]]<br />
<br />
=== Vim Integration ===<br />
<br />
Hoogle can be called from Vim via the lambdabot vim scripts.<br />
* Download and build [[Lambdabot]], which will also build a Hoogle.<br />
* Install the scripts/vim programs into your path<br />
<br />
Then, to invoke hoogle from vim, passing the current buffer line or<br />
region as input:<br />
!!bot hoogle<br />
<br />
For example, if the buffer contains the line:<br />
map<br />
Running !!bot hoogle will replace that with:<br />
Prelude.map :: (a -> b) -> [a] -> [b]<br />
Data.IntMap.map :: (a -> b) -> IntMap a -> IntMap b<br />
Data.IntSet.map :: (Int -> Int) -> IntSet -> IntSet<br />
<br />
If the buffer contains:<br />
(a,b) -> b<br />
Running !!bot hoogle will replace that with:<br />
Prelude.snd :: (a, b) -> b<br />
Prelude.uncurry :: (a -> b -> c) -> (a, b) -> c<br />
Prelude.fst :: (a, b) -> a<br />
<br />
=== Emacs Integration ===<br />
[[Haskell_mode_for_Emacs|haskell-mode]] from versions 2.4 onwards have the function haskell-hoogle, which will hoogle the identifier at point. Setup:<br />
<br />
(require 'haskell-mode)<br />
(define-key haskell-mode-map "\C-ch" 'haskell-hoogle)<br />
;(setq haskell-hoogle-command "hoogle")<br />
<br />
You will need a web browser configured for best results. Here's an example setup for Safari:<br />
<br />
(setq browse-url-browser-function 'browse-url-safari)<br />
(defun browse-url-safari (url &optional new-window)<br />
"Open URL in a new Safari window."<br />
(interactive (browse-url-interactive-arg "URL: "))<br />
(unless<br />
(string= ""<br />
(shell-command-to-string<br />
(concat "open -a Safari " url)))<br />
(message "Starting Safari...")<br />
(start-process (concat "open -a Safari " url) nil "open -a Safari " url)<br />
(message "Starting Safari... done")))<br />
<br />
Alternately, you can build the command-line hoogle (darcs repo below) and uncomment the third line above, then results will appear in a buffer.<br />
<br />
=== Firefox Ubiquity Integration ===<br />
<br />
[https://wiki.mozilla.org/Labs/Ubiquity Ubiquity] provides a graphical command-line for Firefox. To install Ubiquity, see the [https://wiki.mozilla.org/Labs/Ubiquity/Ubiquity_0.1_User_Tutorial tutorial].<br />
<br />
To install the Ubiquity Hoogle command, visit the [http://www.randomhacks.net/git/ubiquity/hoogle/ command's home page] and click <b>Subscribe...</b> when asked whether you want to install it. You may also want to look at the [http://www.randomhacks.net/articles/2008/09/01/ubiquitous-hoogle introductory article].<br />
<br />
== Developers ==<br />
<br />
This work is licensed under the [http://www.gnu.org/copyleft/gpl.html GPL version 2.0]. By submitting any patches to Hoogle you agree to license them under the BSD license, or to assign copyright to Neil Mitchell who will include them under the GPL (either one, your choice). This is so I can relicense Hoogle under the BSD at a later date if that proves beneficial to the Haskell community.<br />
<br />
The work is intended to be helpful, open and free. If the license doesn't meet your needs then talk to me.<br />
<br />
=== The Source Code ===<br />
<br />
<tt>$ darcs get http://code.haskell.org/hoogle/</tt><br />
<br />
Contributions are most welcome. Hoogle is written in Haskell 98 + Heirarchical Modules, I do not wish to change this. Other than that, I'm pretty flexible about most aspects of Hoogle. The [http://code.google.com/p/ndmitchell/issues/list bug tracker] has many outstanding tasks, but please contact me if you have thoughts on doing something major to Hoogle, so I can give some advice.<br />
<br />
== Theoretical Foundations ==<br />
<br />
A lot of related work was done by Rittri [1] and Runciman [2] in the late 80's. Since then Di Cosmo [3] has produced a book on type isomorphisms, which is also related. Unfortunately the implementations that accompanied the earlier works were for functional languages that have since become less popular, and to my knowledge no existing functional programming language has a tool such as Hoogle.<br />
<br />
# Mikael Rittri, Using Types as Search Keys in Function Libraries. Proceedings of the fourth international conference on Functional programming languages and computer architecture: 174-183, June 1989. (http://portal.acm.org/citation.cfm?id=99384)<br />
# Colin Runciman and Ian Toyn, Retrieving reusable software components by polymorphic type. Journal of Functional Programming 1 (2): 191-211, April 1991. (http://portal.acm.org/citation.cfm?id=99383)<br />
# Roberto Di Cosmo. Isomorphisms of types: from lambda-calculus to information retrieval and language design. Birkhauser, 1995. ISBN-0-8176-3763-X (http://www.pps.jussieu.fr/~dicosmo/Publications/ISObook.html)<br />
<br />
I have given two presentations on type searching in Hoogle:<br />
<br />
* [http://www-users.cs.york.ac.uk/~ndm/downloads/slides-hoogle-08_dec_2005.pdf December 2005, York University] - information on Hoogle type searching in versions 1 to 3.<br />
* [http://www.wellquite.org/anglohaskell2008/ August 2008, AngloHaskell] - information on type searching in versions 1 to 4. Audio is also available from that link.<br />
<br />
=== Similar Tools ===<br />
<br />
I didn't know of any similar tools before starting development, and no other tool has really influenced this tool (except the first on this list). The follow are provided for comparison.<br />
<br />
* [http://www.google.com/ Google] - Google rock!<br />
* [http://holumbus.fh-wedel.de/hayoo/hayoo.html Hayoo] - Similar to Hoogle, but with less focus on type search<br />
* [http://www.krugle.com/ Krugle] - Search code, no Haskell :(<br />
<br />
== Acknowledgements ==<br />
<br />
The code is all &copy; [http://www.cs.york.ac.uk/~ndm/ Neil Mitchell] 2004-2008. The initial version was done in my own time, and further refinement and reimplementation was done as part of my PhD. During Summer 2008 I was funded to full-time on Hoogle by [http://code.google.com/soc/ Google Summer of Code] with the [http://haskell.org/ haskell.org] mentoring organisation. Various people have given lots of useful ideas, including my supervisor [http://www.cs.york.ac.uk/~colin/ Colin Runciman], and various members of the [http://www.cs.york.ac.uk/plasma/ Plasma group]. In addition the following people have also contributed some code or significant debugging work:<br />
<br />
* [http://www.cs.kent.ac.uk/people/rpg/tatd2/ Thomas "Bob" Davie]<br />
* [http://www.cse.unsw.edu.au/~dons/ Don Stewart]<br />
* Thomas Jäger<br />
* [http://gaal.livejournal.com/ Gaal Yahas]<br />
* [http://www-users.cs.york.ac.uk/~miked/ Mike Dodds]<br />
* [http://www.cs.chalmers.se/~d00nibro/ Niklas Broberg]<br />
* Esa Ilari Vuokko<br />
* Udo Stenzel<br />
* [http://members.chello.nl/hjgtuyl/ Henk-Jan van Tuyl]<br />
* Gwern Branwen<br />
* Tillmann Rendel<br />
* David Waern<br />
* Ganesh Sittampalam<br />
<br />
In previous versions, all the data was taken from [http://www.zvon.org/other/haskell/Outputglobal/ Zvon's Haskell Guide]. Thanks to their open and friendly policy of allowing the data to be reused, this project became possible. More recent versions use the Hierarchical Libraries as distributed with GHC, and databases generated by Haddock.<br />
<br />
[[Category:Tools]]</div>Emkhttps://wiki.haskell.org/index.php?title=Hoogle&diff=22727Hoogle2008-09-02T01:27:28Z<p>Emk: Ubiquity integration (at the request of Neil Mitchell)</p>
<hr />
<div>Hoogle is a Haskell API search engine, which allows you to search many standard Haskell libraries by either function name, or by approximate type signature.<br />
<br />
* '''Online version:''' http://haskell.org/hoogle<br />
* '''Hackage page:''' http://hackage.haskell.org/cgi-bin/hackage-scripts/package/hoogle<br />
* '''Darcs repository:''' http://code.haskell.org/hoogle<br />
* '''Bug tracker:''' http://code.google.com/p/ndmitchell/issues/list<br />
* '''Manual:''' This page.<br />
<br />
== Hoogle Use ==<br />
<br />
Hoogle can be used in several ways:<br />
<br />
* Online, with the web interface: http://haskell.org/hoogle<br />
* In the [[IRC channel|Haskell IRC channel]], using the [[Lambdabot]] plugin, <tt>@hoogle</tt> and <tt>@hoogle+</tt><br />
* With the command line version [http://hackage.haskell.org/cgi-bin/hackage-scripts/package/hoogle available on Hackage].<br />
<br />
This section describes Hoogle searches, and the flags available from the Hoogle command line tool. The information applies only to Hoogle 4, the next version of Hoogle, and is still being fleshed out.<br />
<br />
=== Searches ===<br />
<br />
Before explaining the syntax of searches, we first give a list of example searches with their meaning:<br />
<br />
* "map" Search for the text "map"<br />
* "con map" Search for the text "map" and the text "con"<br />
* "a -> a" Search for the type "a -> a"<br />
* ":: a -> a" Search for the type "a -> a"<br />
* "a" Search for the text "a"<br />
* ":: a" Search for the type "a"<br />
* "id :: a -> a" Search for the text "id" and the type "a -> a"<br />
<br />
Searches can be either textual (a list of words), or by type (a type signature) or both. A type search may optionally start with a "::" symbol. A search is considered a text search unless it contains a combination of text and symbols, or if it starts with (::). To search for both a type and a name, place a :: between them, for example "undefined :: a"<br />
<br />
Searches can be restricted to a particular module with +Module.Name, or to avoid a module with -Module.Name. The command Module.Name.Foo is treated as +Module.Name Foo.<br />
<br />
Searches can be restricted to a particular package with +packagename, or to avoid a package with -package. By default Hoogle will search a standard set of packages.<br />
<br />
==== Command Line Search Flags ====<br />
<br />
Flags can be specified as <tt>--flag</tt> or <tt>/flag</tt>. Flags requiring arguments are specified as <tt>--flag=arg</tt> or <tt>/flag=arg</tt>. Anything which is not a flag is counted as a search query. Because a console will treat <tt>-></tt> as a redirection, you can do <tt>-#</tt> to get the right character.<br />
<br />
* <tt>--version</tt> Print out version information<br />
* <tt>--help</tt> Show help on the command line flags<br />
* <tt>--include=dir</tt> Specify which directories are searched for necessary files, defaults to "." and the data directory configured with Cabal.<br />
* <tt>--color</tt> Show color output, requires an ANSI compliant terminal, defaults to false<br />
* <tt>--count=int</tt> Maximum number of results to print, defaults to showing all results<br />
* <tt>--start=int</tt> 1-based index of first result to print, defaults to 1<br />
* <tt>--info</tt> Show extended information for the first results<br />
<br />
=== Database Creation ===<br />
<br />
Hoogle has both binary databases (extension .hoo) and textual databases (extension .txt). Textual database files are a list of functions and their types, along with information about type synonyms, instances etc. The textual database files can be generated by [http://haskell.org/haddock/ Haddock] with the <tt>--hoogle</tt> flag. Support for this is now in [http://haskell.org/cabal/ Cabal] with <tt>runhaskell Setup haddock --hoogle</tt>.<br />
<br />
A more detailed tutorial style style post on database creation is available [http://neilmitchell.blogspot.com/2008/08/hoogle-database-generation.html on the author's blog].<br />
<br />
==== Converting text databases to binary databases ====<br />
<br />
A text database can be converted to a binary database with the command <tt>hoogle --convert=file.txt</tt>. Any package dependencies should be specified with <tt>+package</tt> or <tt>--data=package.hoo</tt>, and will require the binary databases for those packages. The output file can be controlled with <tt>--output=file.hoo</tt>.<br />
<br />
==== Merging binary databases ====<br />
<br />
Multiple binary databases can be merged with <tt>hoogle --combine=file1.hoo --combine=file2.hoo</tt>. As before, <tt>--output=default.hoo</tt> can be specified.<br />
<br />
==== Scope of Web Searches ====<br />
<br />
Using the standard web interface, Hoogle searches: array, arrows, base, bytestring, Cabal, cgi, containers, directory, filepath, haskell-src, HUnit, mtl, old-locale, old-time, packedstring, parallel, parsec, pretty, process, QuickCheck, random, stm, template-haskell, time, xhtml.<br />
<br />
Using the [http://haskell.org/hoogle/3/?package=gtk Gtk2hs Hoogle], Hoogle searches only in the Gtk2hs package.<br />
<br />
=== Developer Flags ===<br />
<br />
,f (ArgNone Web) ["w","web"] [PCmdLine] "Run as though it was a CGI script"<br />
,f (ArgNone Test) ["test"] [PCmdLine] "Run the regression tests"<br />
,f (ArgStr Dump) ["dump"] [PCmdLine] "Dump a database for debugging"<br />
,f (ArgFileIn DataFile ["hoo"]) ["d","data"] [PCmdLine,PMultiple] "Database file"<br />
,f (ArgNone Verbose) ["v","verbose"] [PCmdLine] "Display verbose information"<br />
,f (ArgNone Debug) ["debug"] [PCmdLine] "Debugging only"<br />
,f (ArgFileIn TestFile ["txt"]) ["testfile"] [PCmdLine,PMultiple] "Run tests from a file"<br />
,f (ArgFileIn Rank ["txt"]) ["rank"] [PCmdLine,PMultiple] "Generate ranking scores"<br />
<br />
== Hoogle Integration Modes ==<br />
<br />
Hoogle can be integrated with various programs, listed below. Most of these integration modes were contributed by users, and users are encouraged to add more programs to this list.<br />
<br />
=== Firefox Integration ===<br />
<br />
'''From the search bar:''' Go to the [http://haskell.org/hoogle/ Hoogle website] in Firefox and click on "Search plugin", top right hand corner. This will add a Hoogle entry to the search box in Firefox.<br />
<br />
'''As a keyword search:''' You can set up Hoogle as a keyword search in Firefox. This means that you can type <tt>h map</tt> directly into the location bar and you'll jump directly to the Hoogle search results page.<br />
<br />
# Visit Hoogle's web interface: http://haskell.org/hoogle<br />
# Right-click on the text input box and click "Add a Keyword for this Search..."<br />
# Give it a nice short keyword like "h".<br />
<br />
If you want to also search for special symbols in Firefox keyword search, modify the keyword serach URL to be: <tt>javascript:window.location.href="http://haskell.org/hoogle?q=" + encodeURIComponent("%s")</tt><br />
<br />
=== GHCi Integration ===<br />
<br />
Ever feel like having access to hoogle whilst messing around in GHCi? It's relatively easy to integrate the two. I'm on linux, so I don't know how well the following will work if you're on windows.<br />
<br />
First, you need to download and compile Hoogle. Then, we want to move hoogle to somewhere in your system's <code>$PATH</code> (open a terminal and type <code>echo $PATH</code> to see where this is). I suggest ~/bin, although you might want to go for /usr/bin or /usr/local/bin, etc.<br />
<br />
Copy the Hoogle binary and hoogle.txt to the directory you chose. If you're using a version of hoogle pulled straight from darcs, you can ignore everything up until the 'Next, we need to integrate it into GHCi' bit. Otherwise:<br />
<br />
There's a problem in that hoogle doesn't look for hoogle.txt in the system <code>$PATH</code>, it only looks in the current directory. This is a slight pain but is easily worked around: rename the hoogle binary to hoogle-bin, then create a new text file called 'hoogle' with the following contents:<br />
<br />
#! /bin/bash<br />
hoogle-bin -l /path/to/your/chosen/directory/hoogle.txt "$@"<br />
<br />
chmod hoogle to make it executable (try <code>chmod +x hoogle</code>). Now you should be able to run hoogle requests from the shell. Try a few of the examples above.<br />
<br />
Next, we need to integrate it into GHCi. We can execute shell commands with GHCi via <code>:def</code>. Load up GHCi, and type the following:<br />
<br />
:def hoogle \x -> return $ ":!hoogle " ++ x<br />
<br />
If this executes cleanly, you should be able to run hoogle commands from GHCi via <code>:hoogle</code>, i.e. <code>:hoogle map</code> or <code>:hoogle "(a -> b) -> [a] -> [b]"</code>. Be careful: you need the extra quotes when hoogling types, at least on my system. <code>:ho</code> works as an abbreviation of <code>:hoogle</code> (just <code>:h</code> clashes with <code>:help</code>).<br />
<br />
Finally, we want to make this persist across GHCi sessions. GHCi loads a file called ~/.ghci before running, so simply stick the above <code>:def</code> in that file and all should work.<br />
<br />
Contributed by [[User:DavidHouse|DavidHouse]]<br />
<br />
=== Vim Integration ===<br />
<br />
Hoogle can be called from Vim via the lambdabot vim scripts.<br />
* Download and build [[Lambdabot]], which will also build a Hoogle.<br />
* Install the scripts/vim programs into your path<br />
<br />
Then, to invoke hoogle from vim, passing the current buffer line or<br />
region as input:<br />
!!bot hoogle<br />
<br />
For example, if the buffer contains the line:<br />
map<br />
Running !!bot hoogle will replace that with:<br />
Prelude.map :: (a -> b) -> [a] -> [b]<br />
Data.IntMap.map :: (a -> b) -> IntMap a -> IntMap b<br />
Data.IntSet.map :: (Int -> Int) -> IntSet -> IntSet<br />
<br />
If the buffer contains:<br />
(a,b) -> b<br />
Running !!bot hoogle will replace that with:<br />
Prelude.snd :: (a, b) -> b<br />
Prelude.uncurry :: (a -> b -> c) -> (a, b) -> c<br />
Prelude.fst :: (a, b) -> a<br />
<br />
=== Emacs Integration ===<br />
[[Haskell_mode_for_Emacs|haskell-mode]] from versions 2.4 onwards have the function haskell-hoogle, which will hoogle the identifier at point. Setup:<br />
<br />
(require 'haskell-mode)<br />
(define-key haskell-mode-map "\C-ch" 'haskell-hoogle)<br />
;(setq haskell-hoogle-command "hoogle")<br />
<br />
You will need a web browser configured for best results. Here's an example setup for Safari:<br />
<br />
(setq browse-url-browser-function 'browse-url-safari)<br />
(defun browse-url-safari (url &optional new-window)<br />
"Open URL in a new Safari window."<br />
(interactive (browse-url-interactive-arg "URL: "))<br />
(unless<br />
(string= ""<br />
(shell-command-to-string<br />
(concat "open -a Safari " url)))<br />
(message "Starting Safari...")<br />
(start-process (concat "open -a Safari " url) nil "open -a Safari " url)<br />
(message "Starting Safari... done")))<br />
<br />
Alternately, you can build the command-line hoogle (darcs repo below) and uncomment the third line above, then results will appear in a buffer.<br />
<br />
=== Firefox Ubiquity Integration ===<br />
<br />
[https://wiki.mozilla.org/Labs/Ubiquity Ubiquity] provides a graphical command-line for Firefox. To install Ubiquity, see the [https://wiki.mozilla.org/Labs/Ubiquity/Ubiquity_0.1_User_Tutorial tutorial].<br />
<br />
To install the Ubiquity Hoogle command, visit the [http://www.randomhacks.net/git/ubiquity/hoogle/ command's home page] and click <b>Allow...</b> when asked whether you want to install it. You may also want to look at the [http://www.randomhacks.net/articles/2008/09/01/ubiquitous-hoogle introductory article].<br />
<br />
== Developers ==<br />
<br />
This work is licensed under the [http://www.gnu.org/copyleft/gpl.html GPL version 2.0]. By submitting any patches to Hoogle you agree to license them under the BSD license, or to assign copyright to Neil Mitchell who will include them under the GPL (either one, your choice). This is so I can relicense Hoogle under the BSD at a later date if that proves beneficial to the Haskell community.<br />
<br />
The work is intended to be helpful, open and free. If the license doesn't meet your needs then talk to me.<br />
<br />
=== The Source Code ===<br />
<br />
<tt>$ darcs get http://code.haskell.org/hoogle/</tt><br />
<br />
Contributions are most welcome. Hoogle is written in Haskell 98 + Heirarchical Modules, I do not wish to change this. Other than that, I'm pretty flexible about most aspects of Hoogle. The [http://code.google.com/p/ndmitchell/issues/list bug tracker] has many outstanding tasks, but please contact me if you have thoughts on doing something major to Hoogle, so I can give some advice.<br />
<br />
== Theoretical Foundations ==<br />
<br />
A lot of related work was done by Rittri [1] and Runciman [2] in the late 80's. Since then Di Cosmo [3] has produced a book on type isomorphisms, which is also related. Unfortunately the implementations that accompanied the earlier works were for functional languages that have since become less popular, and to my knowledge no existing functional programming language has a tool such as Hoogle.<br />
<br />
# Mikael Rittri, Using Types as Search Keys in Function Libraries. Proceedings of the fourth international conference on Functional programming languages and computer architecture: 174-183, June 1989. (http://portal.acm.org/citation.cfm?id=99384)<br />
# Colin Runciman and Ian Toyn, Retrieving reusable software components by polymorphic type. Journal of Functional Programming 1 (2): 191-211, April 1991. (http://portal.acm.org/citation.cfm?id=99383)<br />
# Roberto Di Cosmo. Isomorphisms of types: from lambda-calculus to information retrieval and language design. Birkhauser, 1995. ISBN-0-8176-3763-X (http://www.pps.jussieu.fr/~dicosmo/Publications/ISObook.html)<br />
<br />
I have given two presentations on type searching in Hoogle:<br />
<br />
* [http://www-users.cs.york.ac.uk/~ndm/downloads/slides-hoogle-08_dec_2005.pdf December 2005, York University] - information on Hoogle type searching in versions 1 to 3.<br />
* [http://www.wellquite.org/anglohaskell2008/ August 2008, AngloHaskell] - information on type searching in versions 1 to 4. Audio is also available from that link.<br />
<br />
=== Similar Tools ===<br />
<br />
I didn't know of any similar tools before starting development, and no other tool has really influenced this tool (except the first on this list). The follow are provided for comparison.<br />
<br />
* [http://www.google.com/ Google] - Google rock!<br />
* [http://holumbus.fh-wedel.de/hayoo/hayoo.html Hayoo] - Similar to Hoogle, but with less focus on type search<br />
* [http://www.krugle.com/ Krugle] - Search code, no Haskell :(<br />
<br />
== Acknowledgements ==<br />
<br />
The code is all &copy; [http://www.cs.york.ac.uk/~ndm/ Neil Mitchell] 2004-2008. The initial version was done in my own time, and further refinement and reimplementation was done as part of my PhD. During Summer 2008 I was funded to full-time on Hoogle by [http://code.google.com/soc/ Google Summer of Code] with the [http://haskell.org/ haskell.org] mentoring organisation. Various people have given lots of useful ideas, including my supervisor [http://www.cs.york.ac.uk/~colin/ Colin Runciman], and various members of the [http://www.cs.york.ac.uk/plasma/ Plasma group]. In addition the following people have also contributed some code or significant debugging work:<br />
<br />
* [http://www.cs.kent.ac.uk/people/rpg/tatd2/ Thomas "Bob" Davie]<br />
* [http://www.cse.unsw.edu.au/~dons/ Don Stewart]<br />
* Thomas Jäger<br />
* [http://gaal.livejournal.com/ Gaal Yahas]<br />
* [http://www-users.cs.york.ac.uk/~miked/ Mike Dodds]<br />
* [http://www.cs.chalmers.se/~d00nibro/ Niklas Broberg]<br />
* Esa Ilari Vuokko<br />
* Udo Stenzel<br />
* [http://members.chello.nl/hjgtuyl/ Henk-Jan van Tuyl]<br />
* Gwern Branwen<br />
* Tillmann Rendel<br />
* David Waern<br />
* Ganesh Sittampalam<br />
<br />
In previous versions, all the data was taken from [http://www.zvon.org/other/haskell/Outputglobal/ Zvon's Haskell Guide]. Thanks to their open and friendly policy of allowing the data to be reused, this project became possible. More recent versions use the Hierarchical Libraries as distributed with GHC, and databases generated by Haddock.<br />
<br />
[[Category:Tools]]</div>Emkhttps://wiki.haskell.org/index.php?title=Sound_data_structures&diff=22589Sound data structures2008-08-24T20:44:16Z<p>Emk: In-memory sound formats</p>
<hr />
<div>At the request of Don Stuart, here is some information about the formats supported by different sound libraries.<br />
<br />
== In-memory data formats ==<br />
<br />
In-memory sound formats are fairly diverse.<br />
<br />
=== Reading and writing sound files ===<br />
<br />
{| border="1"<br />
|-<br />
! Library<br />
! Sound file format<br />
|-<br />
| HCodecs<br />
| <hask>(Audible a) => DiffUArray Int a</hask><br />
|-<br />
| hsndfile<br />
| <hask>MArray</hask> with <hask>Float</hask> and <hask>Double</hask><br />
|-<br />
| HSoundFile<br />
| <hask>[[Double]]</hask><br />
|-<br />
| ALUT<br />
| <hask>OpenAL.AL.Buffer</hask><br />
|-<br />
| WAVE<br />
| <hask>[[Int32]]</hask><br />
|}<br />
<br />
=== Playing sounds ===<br />
<br />
{| border="1"<br />
|-<br />
! Library<br />
! Sound file format<br />
|-<br />
| OpenAL<br />
| <hask>Ptr UInt8</hask>, <hask>Ptr Int16</hask>, 1-N channels<br />
|-<br />
| SDL-mixer<br />
| <hask>ForeignPtr ChunkStruct</hask>, <hask>ForeignPtr MusicStruct</hask><br />
|}<br />
<br />
=== Sound processing libraries ===<br />
<br />
{| border="1"<br />
|-<br />
! Library<br />
! Sound file format<br />
|-<br />
| dsp<br />
| <hask>Array a, [a]</hask><br />
|-<br />
| jack<br />
| Operates via mapping functions<br /><hask>mainMono :: (CFloat -> IO CFloat) -> IO ()</hask><br /><hask>mainStereo :: ((CFloat, CFloat) -> IO (CFloat, CFloat)) -> IO ()</hask><br />
|}<br />
<br />
=== MIDI-based ===<br />
<br />
{| border="1"<br />
|-<br />
! Library<br />
! Sound file format<br />
|-<br />
| HCodecs<br />
| Reads and writes MIDI files<br />
|-<br />
| midi<br />
| Reads and writes MIDI files<br />
|-<br />
| alsa-midi<br />
| Uses midi library<br />
|-<br />
| YampaSynth<br />
| Stand-alone program<br />
|}<br />
<br />
=== Special-purpose APIs only (FFIs, etc.) ===<br />
<br />
{| border="1"<br />
|-<br />
! Library<br />
! Sound file format<br />
|-<br />
| hCsound<br />
| <hask>CsoundPtr</hask><br />
|-<br />
| hsc3<br />
| <hask>UGen</hask><br />
|}<br />
<br />
=== No public sound-buffer API ===<br />
<br />
{| border="1"<br />
|-<br />
! Library<br />
! Sound file format<br />
|-<br />
| hbeat<br />
| The relevant source files are missing!<br />
|-<br />
| hogg<br />
| Very low-level API for Ogg internals only<br />
|-<br />
| libmpd<br />
| No sound buffer API<br />
|-<br />
| sonic-visualizer<br />
| No sound buffer API<br />
|-<br />
| truelevel<br />
| Stand-alone program (uses WAVE)<br />
|-<br />
| wavconvert<br />
| Stand-alone program<br />
|}<br />
<br />
[[Category:Music]]</div>Emkhttps://wiki.haskell.org/index.php?title=Applications_and_libraries/Music_and_sound&diff=22587Applications and libraries/Music and sound2008-08-24T20:36:02Z<p>Emk: Link to in-memory sound format page</p>
<hr />
<div>{{LibrariesPage}}<br />
<br />
== Applications ==<br />
<br />
;[http://www.cse.unsw.edu.au/~dons/hmp3.html hmp3]<br />
:hmp3 is a curses-based mp3 player frontend to mpg321 and mpg123. It is written in Haskell. It is designed to be simple, fast and robust. It's very stable, with one instance running for several months.<br />
<br />
;[http://urchin.earth.li/darcs/ian/minstrel/ minstrel]<br />
:Minstrel is a curses frontend to the GStreamer library written in Haskell.<br />
<br />
;[http://www.lintao.org/repos/hxine hxine]<br />
:A console frontend to the xine library<br />
<br />
;[http://www.annodex.net/~conrad/software/hogg.html HOgg]<br />
:A library for handling the Ogg container format. Note that this just deals with the Ogg container, not with the contained Vorbis audio or Theora video etc. Includes a commandline tool (hogg) for querying files, merging and ripping tracks, hexdumping packets and pages and so on.<br />
<br />
== Libraries ==<br />
<br />
=== Music composition ===<br />
<br />
;[http://haskell.org/haskore/ The Haskore Computer Music System]<br />
:Haskore is a collection of Haskell modules designed for expressing musical structures in the high-level, declarative style of functional programming. Haskore is a means for describing music - in particular Western Music - rather than sound. It is not a vehicle for synthesizing sound produced by musical instruments, for example, although it does capture the way certain (real or imagined) instruments permit control of dynamics and articulation. Haskore compositions can be translated into various audible formats like MIDI, CSound and SuperCollider. (Former versions in LISP could generate traditional notation output, but this is currently not available in the Haskell version.)<br />
<br />
;[[Haskore]] related projects<br />
<br />
;[http://meltin.net/hacks/haskell/ HasChorus]<br />
:A set of Haskell modules written on top of Haskore to make it easier to sequence simple, repetitive music.<br />
<br />
;[[MIDI]] processing libraries, both for MIDI file handling and real-time MIDI<br />
<br />
=== Signal processing ===<br />
<br />
;[http://haskelldsp.sourceforge.net/ HaskellDSP]<br />
:Signal processing coded in Haskell. Contains also some matrix and stochastic computations which are required for signal processing.<br />
:Now managed with [http://darcs.haskell.org/dsp/ darcs repository], shipped via [http://hackage.haskell.org/cgi-bin/hackage-scripts/package/dsp Hackage].<br />
<br />
;[[Synthesizer|Synthesizer library]]<br />
:Signal processing related to audio effects coded in plain Haskell. There is both a low-level interface and a framework for automatical inference of sample rate and amplitude of signals in a sound processing network. This generalizes the usual restricted splitting into audio rate and control rate signals. There is an interface for using synthesized sounds for rendering [[Haskore]] music. Recent versions require [[Numeric Prelude]]. See an [http://dafx04.na.infn.it/WebProc/Proc/P_201.pdf early paper] on the concepts. Highly experimental.<br />
<br />
;[http://www.cs.nott.ac.uk/~ggg/ YampaSynth]<br />
:Modular synthesizer using [http://www.haskell.org/yampa/ Yampa]. Can process SoundFont files. There was a presentation at Haskell Workshop 2007 in Freiburg, Germany, of which a [http://video.google.com/videoplay?docid=-8742804023527878309 video] was recorded.<br />
<br />
=== Wrappers ===<br />
<br />
;HOpenAL<br />
:A Haskell Binding for OpenAL and ALUT. The goal of this project is to provide a binding for OpenAL, a cross-platform 3D audio API, appropriate for use with gaming applications and many other types of audio applications.<br />
<br />
;[http://darcs.haskell.org/~lemmih/hsSDL/ hsSDL]<br />
:Contains bindings to libSDL, libSDL_gfx, libSDL_image, libSDL_mixer and libSDL_ttf.<br />
<br />
;[http://open-projects.net/~shahn/index.php?seite=code JACK and ALSA wrapper], both in a very early stage.<br />
<br />
;[http://www.slavepianos.org/rd/f/207949/ SuperCollider]<br />
:Interface to the realtime software synthesizer [http://www.audiosynth.com/ SuperCollider]. Experimental. Includes widely useful [http://cnmat.berkeley.edu/OpenSoundControl/ OpenSoundControl] module.<br />
<br />
;[[CSound]]<br />
<br />
;[http://www.student.nada.kth.se/~alfonsoa/HLADSPA/ HLADPSA]<br />
:A port of [http://www.ladspa.org/ LADSPA] (Linux Audio Developer's Simple Plugin API) to Haskell. Still highly experimental. The project can be regarded as an example of how to create plugins and shared libraries in Haskell without making use of [http://www.cse.unsw.edu.au/~dons/hs-plugins/ hs-plugins].<br />
<br />
;[http://mcs.une.edu.au/~bsinclai/code/libmpd-haskell.html MPD client library]<br />
:A client library for controlling an MPD server.<br />
<br />
;[[OpenAL]]<br />
:OpenAL (short for Open Audio Library) is a library for creation of a virtual 3D world of sound.<br />
<br />
;[[ALUT]]<br />
:The OpenAL Utility Toolkit (ALUT) is an extension to [[OpenAL]]<br />
<br />
== Hackage==<br />
<br />
* [http://hackage.haskell.org/packages/archive/pkg-list.html#cat:Sound Sound libraries on Hackage]<br />
<br />
== Data formats ==<br />
<br />
Different sound libraries use different in-memory data formats. For a summary by category, see [[Applications and libraries/Music and sound/Formats]].</div>Emkhttps://wiki.haskell.org/index.php?title=Hac_2007_II/Projects&diff=16104Hac 2007 II/Projects2007-10-07T15:56:08Z<p>Emk: Documentation link for probability monads</p>
<hr />
<div>= Generic Information =<br />
<br />
You can apply for an account and a project using<br />
[http://community.haskell.org/admin/ the community server]. Ping Igloo on #haskell-hac07 and he'll create the account. You can also apply for a project.<br />
<br />
Once you have an account and a project, you upload a Darcs repository as follows. First, initialize your repository on the server:<br />
<br />
$ ssh community.haskell.org<br />
you@haskell:~$ cd /srv/code/yourproject<br />
you@haskell:/srv/code/yourproject$ darcs init<br />
<br />
Then, log out and push your repository:<br />
<br />
$ darcs push community.haskell.org:/srv/code/yourproject<br />
<br />
= Who knows about what =<br />
<br />
A list of projects you've worked on or know fairly well:<br />
<br />
{| class="wikitable"<br />
! Name<br />
! Projects<br />
|-<br />
| dons<br />
| ByteString, xmonad, Data.Binary, lambdabot, hmp3, curses, QuickCheck, HPC, hs-plugins, yi, nobench/nofib, ghc<br />
|-<br />
| Binkley<br />
| ghc, darcs (a little bit)<br />
|-<br />
| skogsbaer (Stefan Wehr)<br />
| hscurses, rhaskell<br />
|-<br />
| Pepe<br />
| ghc (front end mostly), ghci debugger, cabal-install (very little)<br />
|-<br />
| ivant<br />
| Functional MetaPost, xmonad<br />
|-<br />
| kolmodin (Lennart Kolmodin)<br />
| Data.Binary, Gentoo Linux, Haste (Haskell Turbo-Edit,a Haskell IDE in Haskell), hackport (hackage for Gentoo), hinotify, dbus-haskell <br />
|-<br />
| Heffalump (Ganesh Sittampalam)<br />
| darcs patch theory<br />
|-<br />
| [[User:Beschmi|beschmi]] (Benedikt Schmidt)<br />
| shim (emacs+ghc-api), darcs, xmonad<br />
|-<br />
| [[User:Conal|conal]] (Conal Elliott)<br />
| functional reactive programming, [[DataDriven]] evaluation, tangible functional programming, graphics, embedded compilers, applicative functors, wxHaskell<br />
|}<br />
<br />
= Active Projects =<br />
Please feel free to describe your current project here!<br />
<br />
== Cabal ==<br />
<br />
cabal-install!<br />
<br />
=== Primitives ===<br />
<br />
help, version, fetch, configure, build, copy, register, haddock,<br />
sdist(package), clean, test<br />
<br />
=== Developer interface ===<br />
<br />
Similar<br />
<br />
=== Naive interface ===<br />
<br />
cabal install xmonad<br />
cabal install xmonad-0.3<br />
<br />
Basic principles: defaults should be such that it just works. Nothing<br />
should fail. It should be usefully descriptive, portable. Safe.<br />
<br />
Hackers: dcoutts, nominolo, lennart, bjorn, dons<br />
<br />
== ByteString network ==<br />
<br />
Change Network.* to use strict ByteStrings instead of Strings. It would also be nice to tidy up the #ifdef mess.<br />
<br />
Things to work on:<br />
<br />
# Add HUnit tests.<br />
# Write an echo server example.<br />
<br />
Done:<br />
<br />
# [http://code.haskell.org/network-bytestring/ Darcs repository] -- Hackage ready version of the send and receive functions (Network.Socket.ByteString).<br />
# Haddock documentation (could need some polish).<br />
# Pushed to [http://hackage.haskell.org/cgi-bin/hackage-scripts/package/network-bytestring-0.1.1 Hackage].<br />
<br />
Current hacker(s): tibbe (Johan Tibell)<br />
<br />
== Data.Binary ==<br />
<br />
updating to 6.8, adding smp parallel testsuite driver.<br />
<br />
Current hackers: dons<br />
<br />
== xmonad ==<br />
<br />
Testing, HPC coverage, code polishing., new layouts, notification support, scratchpad (a la ion)<br />
<br />
Current hackers: dons, ganesh, conrad, nomeata, tibbe, beschmi<br />
<br />
== Probability monads ==<br />
<br />
A really cool existing implementation: [http://web.engr.oregonstate.edu/~erwig/pfp/ Probabilistic functional programming]<br />
<br />
[http://www.randomhacks.net/articles/2007/10/02/probability-monads-at-hac-07-ii Darcs repository and draft paper].<br />
<br />
Things to work on:<br />
<br />
# Get MaybeT into Hackage.<br />
# Is WriterT really the right monad transformer? We want the join and bind operations, but not the rest of the MonadWriter type class.<br />
# Should probabilities be represented as floats, fractions or a type class?<br />
# Can this run fast enough to be useful?<br />
<br />
Done:<br />
<br />
# [http://www.randomhacks.net/tmp/MaybeT/Control-Monad-Maybe.html MaybeT docs] and [http://code.haskell.org/maybet/ Darcs repository]. This should have all the features of [[New_monads/MaybeT]], except for the potentially ambiguous MonadPlus instance.<br />
# [http://code.haskell.org/monadrandom/ MonadRandom] is now documented and packaged.<br />
# The [http://www.randomhacks.net/darcs/probability/ Probability] library:<br />
#* Now builds using external MaybeT and MonadRandom.<br />
#* Added support for representing probabilities as doubles and floats.<br />
#* Merged Dist instances and helper code for Rand, BRand, DDist, and BDDist from example code and paper.<br />
#* [http://www.randomhacks.net/tmp/ProbabilityMonads/Control-Monad-Distribution-Base.html Documentation]<br />
# Rough versions of all packages in Hackage: [http://hackage.haskell.org/cgi-bin/hackage-scripts/package/MaybeT-0.1.0 MaybeT], [http://hackage.haskell.org/cgi-bin/hackage-scripts/package/MonadRandom-0.1.0 MonadRandom], [http://hackage.haskell.org/cgi-bin/hackage-scripts/package/ProbabilityMonads-0.1.0 ProbabilityMonads]<br />
<br />
Current hacker(s): ekidd (Eric Kidd)<br />
<br />
== Yi hacking ==<br />
<br />
Yi needs a lot of love and doesn't work out of the box for me. One of the nice thing to try to do is to add the collaborative editing plugin to yi (in the spirit of the [http://gobby.0x539.de/trac/ Gobby editor]).<br />
* vincenz: Definitely would like to add some usability input here regarding Gobby functionality (having used it and having found it lacking in several areas, areas that could be improved through reusing some darcs theory).<br />
* ivant: also need to add unicode support to yi<br />
* vincenz: Move away from System.Filepath to something std supported<br />
* Cabalize the current 'Setup.hs' *Cabal hackers welcome for help*<br />
* Update the regex dependencies to work with the newest one.<br />
* Work splatch into Yi<br />
<br />
Current hacker(s): ivant (Ivan Tarasov), vincenz (Christophe Poucet)<br />
<br />
== Splatch ==<br />
Patching of splices, or otherwise said, a patch-model for working concurrently on one piece of text.<br />
<br />
Current hacker(s): ivant (Ivan Tarasov), vincenz (Christophe Poucet)<br />
<br />
== Shim ==<br />
<br />
Port shim to GHC 6.8<br />
<br />
Current hacker(s): beschmi (Benedikt Schmidt)<br />
<br />
== Tangible functional programming ==<br />
<br />
Some to-do items:<br />
* More built-ins<br />
* Save<br />
* Improved user experience for gestural composition, e.g., drag & drop<br />
* Does it work on MacOS? Linux?<br />
* Sum types<br />
* Code generation via hs-plugins or ghc-api or Harpy.<br />
<br />
Current hacker(s): [[User:Conal|conal]]<br />
<br />
== General composition tools ==<br />
<br />
=== Type composition & related ===<br />
<br />
[[TypeCompose]]: some classes & instances for forms of type composition (including contravariant functors and applicative functors)<br />
<br />
Current hacker(s): [[User:Conal|conal]]<br />
<br />
=== Deep arrows ===<br />
<br />
[[DeepArrow]]: a framework for composable "editors" of pure values<br />
<br />
Current hacker(s): [[User:Conal|conal]]<br />
<br />
== Source browsing ==<br />
<br />
[http://tiddlywiki.com TiddlyWiki]-based code & documentation browser. Syntax-colored and all identifiers fully hyperlinked to sources. Thanks to TiddlyWiki, the browsing experience is fluid & self-organizing.<br />
<br />
Bring together disparate functionality from HsColour & Haddock, and add auto-generated hyperlinking. Apply to all the code on Hackage.<br />
<br />
Current hacker(s): [[User:Conal|conal]]<br />
<br />
== Graphics ==<br />
<br />
Fast general, pure-Haskell image synthesis (speed of [http://conal.net/Pan Pan] or [http://conal.net/Pajama Pajama] but via ghc). Use Harpy or a new hs-plugins.<br />
<br />
Current hacker(s): [[User:Conal|conal]]<br />
<br />
== General dependency tracking & updating ==<br />
<br />
Simple, general dependency tracking & execution formulated as an [[applicative functor]] and using [[DataDriven]] computation. Applies uniformly to recompiling, re-executing, installing, compiler-recompiling, GUI specification and execution, etc. For compilation, it can give more precise (efficient) recompilation than language-specific tools (e.g., <code>hmake</code> and <code>ghc --make</code>) without being language-specific. Yields a continuous build system for free. No "make" info required (since inferred by construction). (Nontrivial language changes/improvements may be necessary.)<br />
<br />
Current hacker(s): [[User:Conal|conal]]<br />
<br />
== Backtraces in the GHCi debugger ==<br />
<br />
This has turned out to be really complicated, so look at [http://hackage.haskell.org/trac/ghc/wiki/LightweightCCSCallStack here] for the details. Sadly, Alexey stays only for the first day.<br />
<br />
Current hackers: pepe, Alexey<br />
<br />
== Coverage recording in the GHC testsuite ==<br />
<br />
We would like HPC coverage recording to be performed as a possible part of running the tests in the GHC testsuite. Code targeted by this could be the compiler code itself, the runtime system, the library code of a tested library, and the test code.<br />
<br />
Current hackers: thorkilnaur<br />
<br />
== Shim ==<br />
<br />
We still believe that Shim has a great potential to become an awesome IDE, and so we've decided to make it compatible with ghc 6.8<br />
<br />
Current hackers: beschmi, pepe</div>Emkhttps://wiki.haskell.org/index.php?title=Hac_2007_II/Projects&diff=16103Hac 2007 II/Projects2007-10-07T15:51:58Z<p>Emk: Pointed to HackageDB pages for probability monads and supporting libraries</p>
<hr />
<div>= Generic Information =<br />
<br />
You can apply for an account and a project using<br />
[http://community.haskell.org/admin/ the community server]. Ping Igloo on #haskell-hac07 and he'll create the account. You can also apply for a project.<br />
<br />
Once you have an account and a project, you upload a Darcs repository as follows. First, initialize your repository on the server:<br />
<br />
$ ssh community.haskell.org<br />
you@haskell:~$ cd /srv/code/yourproject<br />
you@haskell:/srv/code/yourproject$ darcs init<br />
<br />
Then, log out and push your repository:<br />
<br />
$ darcs push community.haskell.org:/srv/code/yourproject<br />
<br />
= Who knows about what =<br />
<br />
A list of projects you've worked on or know fairly well:<br />
<br />
{| class="wikitable"<br />
! Name<br />
! Projects<br />
|-<br />
| dons<br />
| ByteString, xmonad, Data.Binary, lambdabot, hmp3, curses, QuickCheck, HPC, hs-plugins, yi, nobench/nofib, ghc<br />
|-<br />
| Binkley<br />
| ghc, darcs (a little bit)<br />
|-<br />
| skogsbaer (Stefan Wehr)<br />
| hscurses, rhaskell<br />
|-<br />
| Pepe<br />
| ghc (front end mostly), ghci debugger, cabal-install (very little)<br />
|-<br />
| ivant<br />
| Functional MetaPost, xmonad<br />
|-<br />
| kolmodin (Lennart Kolmodin)<br />
| Data.Binary, Gentoo Linux, Haste (Haskell Turbo-Edit,a Haskell IDE in Haskell), hackport (hackage for Gentoo), hinotify, dbus-haskell <br />
|-<br />
| Heffalump (Ganesh Sittampalam)<br />
| darcs patch theory<br />
|-<br />
| [[User:Beschmi|beschmi]] (Benedikt Schmidt)<br />
| shim (emacs+ghc-api), darcs, xmonad<br />
|-<br />
| [[User:Conal|conal]] (Conal Elliott)<br />
| functional reactive programming, [[DataDriven]] evaluation, tangible functional programming, graphics, embedded compilers, applicative functors, wxHaskell<br />
|}<br />
<br />
= Active Projects =<br />
Please feel free to describe your current project here!<br />
<br />
== Cabal ==<br />
<br />
cabal-install!<br />
<br />
=== Primitives ===<br />
<br />
help, version, fetch, configure, build, copy, register, haddock,<br />
sdist(package), clean, test<br />
<br />
=== Developer interface ===<br />
<br />
Similar<br />
<br />
=== Naive interface ===<br />
<br />
cabal install xmonad<br />
cabal install xmonad-0.3<br />
<br />
Basic principles: defaults should be such that it just works. Nothing<br />
should fail. It should be usefully descriptive, portable. Safe.<br />
<br />
Hackers: dcoutts, nominolo, lennart, bjorn, dons<br />
<br />
== ByteString network ==<br />
<br />
Change Network.* to use strict ByteStrings instead of Strings. It would also be nice to tidy up the #ifdef mess.<br />
<br />
Things to work on:<br />
<br />
# Add HUnit tests.<br />
# Write an echo server example.<br />
<br />
Done:<br />
<br />
# [http://code.haskell.org/network-bytestring/ Darcs repository] -- Hackage ready version of the send and receive functions (Network.Socket.ByteString).<br />
# Haddock documentation (could need some polish).<br />
# Pushed to [http://hackage.haskell.org/cgi-bin/hackage-scripts/package/network-bytestring-0.1.1 Hackage].<br />
<br />
Current hacker(s): tibbe (Johan Tibell)<br />
<br />
== Data.Binary ==<br />
<br />
updating to 6.8, adding smp parallel testsuite driver.<br />
<br />
Current hackers: dons<br />
<br />
== xmonad ==<br />
<br />
Testing, HPC coverage, code polishing., new layouts, notification support, scratchpad (a la ion)<br />
<br />
Current hackers: dons, ganesh, conrad, nomeata, tibbe, beschmi<br />
<br />
== Probability monads ==<br />
<br />
A really cool existing implementation: [http://web.engr.oregonstate.edu/~erwig/pfp/ Probabilistic functional programming]<br />
<br />
[http://www.randomhacks.net/articles/2007/10/02/probability-monads-at-hac-07-ii Darcs repository and draft paper].<br />
<br />
Things to work on:<br />
<br />
# Get MaybeT into Hackage.<br />
# Is WriterT really the right monad transformer? We want the join and bind operations, but not the rest of the MonadWriter type class.<br />
# Should probabilities be represented as floats, fractions or a type class?<br />
# Can this run fast enough to be useful?<br />
<br />
Done:<br />
<br />
# [http://www.randomhacks.net/tmp/MaybeT/Control-Monad-Maybe.html MaybeT docs] and [http://code.haskell.org/maybet/ Darcs repository]. This should have all the features of [[New_monads/MaybeT]], except for the potentially ambiguous MonadPlus instance.<br />
# [http://code.haskell.org/monadrandom/ MonadRandom] is now documented and packaged.<br />
# The [http://www.randomhacks.net/darcs/probability/ Probability] library:<br />
#* Now builds using external MaybeT and MonadRandom.<br />
#* Added support for representing probabilities as doubles and floats.<br />
#* Merged Dist instances and helper code for Rand, BRand, DDist, and BDDist from example code and paper.<br />
# Rough versions of all packages in Hackage: [http://hackage.haskell.org/cgi-bin/hackage-scripts/package/MaybeT-0.1.0 MaybeT], [http://hackage.haskell.org/cgi-bin/hackage-scripts/package/MonadRandom-0.1.0 MonadRandom], [http://hackage.haskell.org/cgi-bin/hackage-scripts/package/ProbabilityMonads-0.1.0 ProbabilityMonads]<br />
<br />
Current hacker(s): ekidd (Eric Kidd)<br />
<br />
== Yi hacking ==<br />
<br />
Yi needs a lot of love and doesn't work out of the box for me. One of the nice thing to try to do is to add the collaborative editing plugin to yi (in the spirit of the [http://gobby.0x539.de/trac/ Gobby editor]).<br />
* vincenz: Definitely would like to add some usability input here regarding Gobby functionality (having used it and having found it lacking in several areas, areas that could be improved through reusing some darcs theory).<br />
* ivant: also need to add unicode support to yi<br />
* vincenz: Move away from System.Filepath to something std supported<br />
* Cabalize the current 'Setup.hs' *Cabal hackers welcome for help*<br />
* Update the regex dependencies to work with the newest one.<br />
* Work splatch into Yi<br />
<br />
Current hacker(s): ivant (Ivan Tarasov), vincenz (Christophe Poucet)<br />
<br />
== Splatch ==<br />
Patching of splices, or otherwise said, a patch-model for working concurrently on one piece of text.<br />
<br />
Current hacker(s): ivant (Ivan Tarasov), vincenz (Christophe Poucet)<br />
<br />
== Shim ==<br />
<br />
Port shim to GHC 6.8<br />
<br />
Current hacker(s): beschmi (Benedikt Schmidt)<br />
<br />
== Tangible functional programming ==<br />
<br />
Some to-do items:<br />
* More built-ins<br />
* Save<br />
* Improved user experience for gestural composition, e.g., drag & drop<br />
* Does it work on MacOS? Linux?<br />
* Sum types<br />
* Code generation via hs-plugins or ghc-api or Harpy.<br />
<br />
Current hacker(s): [[User:Conal|conal]]<br />
<br />
== General composition tools ==<br />
<br />
=== Type composition & related ===<br />
<br />
[[TypeCompose]]: some classes & instances for forms of type composition (including contravariant functors and applicative functors)<br />
<br />
Current hacker(s): [[User:Conal|conal]]<br />
<br />
=== Deep arrows ===<br />
<br />
[[DeepArrow]]: a framework for composable "editors" of pure values<br />
<br />
Current hacker(s): [[User:Conal|conal]]<br />
<br />
== Source browsing ==<br />
<br />
[http://tiddlywiki.com TiddlyWiki]-based code & documentation browser. Syntax-colored and all identifiers fully hyperlinked to sources. Thanks to TiddlyWiki, the browsing experience is fluid & self-organizing.<br />
<br />
Bring together disparate functionality from HsColour & Haddock, and add auto-generated hyperlinking. Apply to all the code on Hackage.<br />
<br />
Current hacker(s): [[User:Conal|conal]]<br />
<br />
== Graphics ==<br />
<br />
Fast general, pure-Haskell image synthesis (speed of [http://conal.net/Pan Pan] or [http://conal.net/Pajama Pajama] but via ghc). Use Harpy or a new hs-plugins.<br />
<br />
Current hacker(s): [[User:Conal|conal]]<br />
<br />
== General dependency tracking & updating ==<br />
<br />
Simple, general dependency tracking & execution formulated as an [[applicative functor]] and using [[DataDriven]] computation. Applies uniformly to recompiling, re-executing, installing, compiler-recompiling, GUI specification and execution, etc. For compilation, it can give more precise (efficient) recompilation than language-specific tools (e.g., <code>hmake</code> and <code>ghc --make</code>) without being language-specific. Yields a continuous build system for free. No "make" info required (since inferred by construction). (Nontrivial language changes/improvements may be necessary.)<br />
<br />
Current hacker(s): [[User:Conal|conal]]<br />
<br />
== Backtraces in the GHCi debugger ==<br />
<br />
This has turned out to be really complicated, so look at [http://hackage.haskell.org/trac/ghc/wiki/LightweightCCSCallStack here] for the details. Sadly, Alexey stays only for the first day.<br />
<br />
Current hackers: pepe, Alexey<br />
<br />
== Coverage recording in the GHC testsuite ==<br />
<br />
We would like HPC coverage recording to be performed as a possible part of running the tests in the GHC testsuite. Code targeted by this could be the compiler code itself, the runtime system, the library code of a tested library, and the test code.<br />
<br />
Current hackers: thorkilnaur<br />
<br />
== Shim ==<br />
<br />
We still believe that Shim has a great potential to become an awesome IDE, and so we've decided to make it compatible with ghc 6.8<br />
<br />
Current hackers: beschmi, pepe</div>Emkhttps://wiki.haskell.org/index.php?title=Hac_2007_II/Projects&diff=16087Hac 2007 II/Projects2007-10-06T14:00:33Z<p>Emk: Progress report on probability distribution library</p>
<hr />
<div>= Generic Information =<br />
<br />
You can apply for an account and a project using<br />
[http://community.haskell.org/admin/ the community server]. Ping Igloo on #haskell-hac07 and he'll create the account. You can also apply for a project.<br />
<br />
Once you have an account and a project, you upload a Darcs repository as follows. First, initialize your repository on the server:<br />
<br />
$ ssh community.haskell.org<br />
you@haskell:~$ cd /srv/code/yourproject<br />
you@haskell:/srv/code/yourproject$ darcs init<br />
<br />
Then, log out and push your repository:<br />
<br />
$ darcs push community.haskell.org:/srv/code/yourproject<br />
<br />
= Who knows about what =<br />
<br />
A list of projects you've worked on or know fairly well:<br />
<br />
{| class="wikitable"<br />
! Name<br />
! Projects<br />
|-<br />
| dons<br />
| ByteString, xmonad, Data.Binary, lambdabot, hmp3, curses, QuickCheck, HPC, hs-plugins, yi, nobench/nofib, ghc<br />
|-<br />
| Binkley<br />
| ghc, darcs (a little bit)<br />
|-<br />
| skogsbaer (Stefan Wehr)<br />
| hscurses, rhaskell<br />
|-<br />
| Pepe<br />
| ghc (front end mostly), ghci debugger, cabal-install (very little)<br />
|-<br />
| ivant<br />
| Functional MetaPost, xmonad<br />
|-<br />
| kolmodin (Lennart Kolmodin)<br />
| Data.Binary, Gentoo Linux, Haste (Haskell Turbo-Edit,a Haskell IDE in Haskell), hackport (hackage for Gentoo), hinotify, dbus-haskell <br />
|-<br />
| Heffalump (Ganesh Sittampalam)<br />
| darcs patch theory<br />
|-<br />
| [[User:Beschmi|beschmi]] (Benedikt Schmidt)<br />
| shim (emacs+ghc-api), darcs, xmonad<br />
|-<br />
| [[User:Conal|conal]] (Conal Elliott)<br />
| functional reactive programming, [[DataDriven]] evaluation, tangible functional programming, graphics, embedded compilers, applicative functors, wxHaskell<br />
|}<br />
<br />
= Active Projects =<br />
Please feel free to describe your current project here!<br />
<br />
== Cabal ==<br />
<br />
== ByteString network ==<br />
<br />
Change Network.* to use strict ByteStrings instead of Strings. It would also be nice to tidy up the #ifdef mess.<br />
<br />
Things to work on:<br />
<br />
# Add HUnit tests.<br />
# Write an echo server example.<br />
<br />
Done:<br />
<br />
# [http://code.haskell.org/network-bytestring/ Darcs repository] -- Hackage ready version of the send and receive functions (Network.Socket.ByteString).<br />
# Haddock documentation (could need some polish).<br />
<br />
Current hacker(s): tibbe (Johan Tibell)<br />
<br />
== Data.Binary ==<br />
<br />
updating to 6.8, adding smp parallel testsuite driver.<br />
<br />
Current hackers: dons<br />
<br />
== xmonad ==<br />
<br />
Testing, HPC coverage, code polishing., new layouts, notification support, scratchpad (a la ion)<br />
<br />
Current hackers: dons, ganesh, conrad, nomeata, tibbe, beschmi<br />
<br />
== Probability monads ==<br />
<br />
A really cool existing implementation: [http://web.engr.oregonstate.edu/~erwig/pfp/ Probabilistic functional programming]<br />
<br />
[http://www.randomhacks.net/articles/2007/10/02/probability-monads-at-hac-07-ii Darcs repository and draft paper].<br />
<br />
Things to work on:<br />
<br />
# Get MaybeT into Hackage.<br />
# Is WriterT really the right monad transformer? We want the join and bind operations, but not the rest of the MonadWriter type class.<br />
# Should probabilities be represented as floats, fractions or a type class?<br />
# Can this run fast enough to be useful?<br />
<br />
Done:<br />
<br />
# [http://www.randomhacks.net/tmp/MaybeT/Control-Monad-Maybe.html MaybeT docs] and [http://code.haskell.org/maybet/ Darcs repository]. This should have all the features of [[New_monads/MaybeT]], except for the potentially ambiguous MonadPlus instance.<br />
# [http://code.haskell.org/monadrandom/ MonadRandom] is now documented and packaged.<br />
# The [http://www.randomhacks.net/darcs/probability/ Probability] library:<br />
#* Now builds using external MaybeT and MonadRandom.<br />
#* Added support for representing probabilities as doubles and floats.<br />
#* Merged Dist instances and helper code for Rand, BRand, DDist, and BDDist from example code and paper.<br />
<br />
Current hacker(s): ekidd (Eric Kidd)<br />
<br />
== Yi hacking ==<br />
<br />
Yi needs a lot of love and doesn't work out of the box for me. One of the nice thing to try to do is to add the collaborative editing plugin to yi (in the spirit of the [http://gobby.0x539.de/trac/ Gobby editor]).<br />
* vincenz: Definitely would like to add some usability input here regarding Gobby functionality (having used it and having found it lacking in several areas, areas that could be improved through reusing some darcs theory).<br />
* ivant: also need to add unicode support to yi<br />
* vincenz: Move away from System.Filepath to something std supported<br />
* Cabalize the current 'Setup.hs' *Cabal hackers welcome for help*<br />
* Update the regex dependencies to work with the newest one.<br />
* Work splatch into Yi<br />
<br />
Current hacker(s): ivant (Ivan Tarasov), vincenz (Christophe Poucet)<br />
<br />
== Splatch ==<br />
Patching of splices, or otherwise said, a patch-model for working concurrently on one piece of text.<br />
<br />
Current hacker(s): ivant (Ivan Tarasov), vincenz (Christophe Poucet)<br />
<br />
== Shim ==<br />
<br />
Port shim to GHC 6.8<br />
<br />
Current hacker(s): beschmi (Benedikt Schmidt)<br />
<br />
== Tangible functional programming ==<br />
<br />
Some to-do items:<br />
* More built-ins<br />
* Save<br />
* Improved user experience for gestural composition, e.g., drag & drop<br />
* Does it work on MacOS? Linux?<br />
* Sum types<br />
* Code generation via hs-plugins or ghc-api or Harpy.<br />
<br />
Current hacker(s): [[User:Conal|conal]]<br />
<br />
== General composition tools ==<br />
<br />
=== Type composition & related ===<br />
<br />
[[TypeCompose]]: some classes & instances for forms of type composition (including contravariant functors and applicative functors)<br />
<br />
Current hacker(s): [[User:Conal|conal]]<br />
<br />
=== Deep arrows ===<br />
<br />
[[DeepArrow]]: a framework for composable "editors" of pure values<br />
<br />
Current hacker(s): [[User:Conal|conal]]<br />
<br />
== Source browsing ==<br />
<br />
[http://tiddlywiki.com TiddlyWiki]-based code & documentation browser. Syntax-colored and all identifiers fully hyperlinked to sources. Thanks to TiddlyWiki, the browsing experience is fluid & self-organizing.<br />
<br />
Bring together disparate functionality from HsColour & Haddock, and add auto-generated hyperlinking. Apply to all the code on Hackage.<br />
<br />
Current hacker(s): [[User:Conal|conal]]<br />
<br />
== Graphics ==<br />
<br />
Fast general, pure-Haskell image synthesis (speed of [http://conal.net/Pan Pan] or [http://conal.net/Pajama Pajama] but via ghc). Use Harpy or a new hs-plugins.<br />
<br />
Current hacker(s): [[User:Conal|conal]]<br />
<br />
== General dependency tracking & updating ==<br />
<br />
Simple, general dependency tracking & execution formulated as an [[applicative functor]] and using [[DataDriven]] computation. Applies uniformly to recompiling, re-executing, installing, compiler-recompiling, GUI specification and execution, etc. For compilation, it can give more precise (efficient) recompilation than language-specific tools (e.g., <code>hmake</code> and <code>ghc --make</code>) without being language-specific. Yields a continuous build system for free. No "make" info required (since inferred by construction). (Nontrivial language changes/improvements may be necessary.)<br />
<br />
Current hacker(s): [[User:Conal|conal]]<br />
<br />
== Backtraces in the GHCi debugger ==<br />
<br />
This has turned out to be really complicated, so look at [http://hackage.haskell.org/trac/ghc/wiki/LightweightCCSCallStack here] for the details. Sadly, Alexey stays only for the first day.<br />
<br />
Current hackers: pepe, Alexey<br />
<br />
== Coverage recording in the GHC testsuite ==<br />
<br />
We would like HPC coverage recording to be performed as a possible part of running the tests in the GHC testsuite. Code targeted by this could be the compiler code itself, the runtime system, the library code of a tested library, and the test code.<br />
<br />
Current hackers: thorkilnaur</div>Emkhttps://wiki.haskell.org/index.php?title=Hac_2007_II/Projects&diff=16053Hac 2007 II/Projects2007-10-06T08:54:36Z<p>Emk: Initial progress for probability library.</p>
<hr />
<div>= Generic Information =<br />
<br />
You can apply for an account and a project using<br />
[http://community.haskell.org/admin/ the community server]. Ping Igloo on #haskell-hac07 and he'll create the account. You can also apply for a project.<br />
<br />
Once you have an account and a project, you upload a Darcs repository as follows. First, initialize your repository on the server:<br />
<br />
$ ssh community.haskell.org<br />
you@haskell:~$ cd /srv/code/yourproject<br />
you@haskell:/srv/code/yourproject$ darcs init<br />
<br />
Then, log out and push your repository:<br />
<br />
$ darcs push community.haskell.org:/srv/code/yourproject<br />
<br />
= Who knows about what =<br />
<br />
A list of projects you've worked on or know fairly well:<br />
<br />
{| class="wikitable"<br />
! Name<br />
! Projects<br />
|-<br />
| dons<br />
| ByteString, xmonad, Data.Binary, lambdabot, hmp3, curses, QuickCheck, HPC, hs-plugins, yi, nobench/nofib, ghc<br />
|-<br />
| Binkley<br />
| ghc, darcs (a little bit)<br />
|-<br />
| skogsbaer (Stefan Wehr)<br />
| hscurses, rhaskell<br />
|-<br />
| Pepe<br />
| ghc (front end mostly), ghci debugger, cabal-install (very little)<br />
|-<br />
| ivant<br />
| Functional MetaPost, xmonad<br />
|-<br />
| kolmodin (Lennart Kolmodin)<br />
| Data.Binary, Gentoo Linux, Haste (Haskell Turbo-Edit,a Haskell IDE in Haskell), hackport (hackage for Gentoo), hinotify, dbus-haskell <br />
|-<br />
| Heffalump (Ganesh Sittampalam)<br />
| darcs patch theory<br />
|-<br />
| [[User:Conal|conal]] (Conal Elliott)<br />
| functional reactive programming, [[DataDriven]] evaluation, tangible functional programming, graphics, embedded compilers, applicative functors, wxHaskell<br />
|}<br />
<br />
= Active Projects =<br />
Please feel free to describe your current project here!<br />
<br />
== Cabal ==<br />
<br />
== ByteString network ==<br />
<br />
Change Network.* to use strict ByteStrings instead of Strings. It would also be nice to tidy up the #ifdef mess.<br />
<br />
Current hacker(s): tibbe (Johan Tibell)<br />
<br />
== Data.Binary ==<br />
<br />
updating to 6.8<br />
<br />
Current hackers: dons<br />
<br />
== Probability monads ==<br />
<br />
A really cool existing implementation: [http://web.engr.oregonstate.edu/~erwig/pfp/ Probabilistic functional programming]<br />
<br />
[http://www.randomhacks.net/articles/2007/10/02/probability-monads-at-hac-07-ii Darcs repository and draft paper].<br />
<br />
Things to work on:<br />
<br />
# Get MaybeT into Hackage.<br />
# Is WriterT really the right monad transformer? We want the join and bind operations, but not the rest of the MonadWriter type class.<br />
# Should probabilities be represented as floats, fractions or a type class?<br />
# Can this run fast enough to be useful?<br />
<br />
Done:<br />
<br />
# [http://www.randomhacks.net/tmp/MaybeT/Control-Monad-Maybe.html MaybeT docs] and [http://code.haskell.org/maybet/ Darcs repository]. This should have all the features of [[New_monads/MaybeT]], except for the potentially ambiguous MonadPlus instance.<br />
# [http://code.haskell.org/monadrandom/ MonadRandom] is now documented and packaged.<br />
# The [http://www.randomhacks.net/darcs/probability/ Probability] library:<br />
#* Now builds using external MaybeT and MonadRandom.<br />
<br />
Current hacker(s): ekidd (Eric Kidd)<br />
<br />
== Yi hacking ==<br />
<br />
Yi needs a lot of love and doesn't work out of the box for me. One of the nice thing to try to do is to add the collaborative editing plugin to yi (in the spirit of the [http://gobby.0x539.de/trac/ Gobby editor]).<br />
* vincenz: Definitely would like to add some usability input here regarding Gobby functionality (having used it and having found it lacking in several areas, areas that could be improved through reusing some darcs theory).<br />
* ivant: also need to add unicode support to yi<br />
* vincenz: Move away from System.Filepath to something std supported<br />
* Cabalize the current 'Setup.hs' *Cabal hackers welcome for help*<br />
* Update the regex dependencies to work with the newest one.<br />
* Work splatch into Yi<br />
<br />
Current hacker(s): ivant (Ivan Tarasov), vincenz (Christophe Poucet)<br />
<br />
== Splatch ==<br />
Patching of splices, or otherwise said, a patch-model for working concurrently on one piece of text.<br />
<br />
Current hacker(s): ivant (Ivan Tarasov), vincenz (Christophe Poucet)<br />
<br />
== Tangible functional programming ==<br />
<br />
Some to-do items:<br />
* More built-ins<br />
* Save<br />
* Improved user experience for gestural composition, e.g., drag & drop<br />
* Does it work on MacOS? Linux?<br />
* Sum types<br />
* Code generation via hs-plugins or ghc-api or Harpy.<br />
<br />
Current hacker(s): [[User:Conal|conal]]<br />
<br />
== General composition tools ==<br />
<br />
=== Type composition & related ===<br />
<br />
[[TypeCompose]]: some classes & instances for forms of type composition (including contravariant functors and applicative functors)<br />
<br />
Current hacker(s): [[User:Conal|conal]]<br />
<br />
=== Deep arrows ===<br />
<br />
[[DeepArrow]]: a framework for composable "editors" of pure values<br />
<br />
Current hacker(s): [[User:Conal|conal]]<br />
<br />
== Source browsing ==<br />
<br />
[http://tiddlywiki.com TiddlyWiki]-based code & documentation browser. Syntax-colored and all identifiers fully hyperlinked to sources. Thanks to TiddlyWiki, the browsing experience is fluid & self-organizing.<br />
<br />
Bring together disparate functionality from HsColour & Haddock, and add auto-generated hyperlinking. Apply to all the code on Hackage.<br />
<br />
Current hacker(s): [[User:Conal|conal]]<br />
<br />
== Graphics ==<br />
<br />
Fast general, pure-Haskell image synthesis (speed of [http://conal.net/Pan Pan] or [http://conal.net/Pajama Pajama] but via ghc). Use Harpy or a new hs-plugins.<br />
<br />
Current hacker(s): [[User:Conal|conal]]<br />
<br />
== General dependency tracking & updating ==<br />
<br />
Simple, general dependency tracking & execution formulated as an [[applicative functor]] and using [[DataDriven]] computation. Applies uniformly to recompiling, re-executing, installing, compiler-recompiling, GUI specification and execution, etc. For compilation, it can give more precise (efficient) recompilation than language-specific tools (e.g., <code>hmake</code> and <code>ghc --make</code>) without being language-specific. Yields a continuous build system for free. No "make" info required (since inferred by construction). (Nontrivial language changes/improvements may be necessary.)<br />
<br />
Current hacker(s): [[User:Conal|conal]]</div>Emkhttps://wiki.haskell.org/index.php?title=Hac_2007_II/Projects&diff=16052Hac 2007 II/Projects2007-10-06T08:43:19Z<p>Emk: MonadRandom</p>
<hr />
<div>= Generic Information =<br />
<br />
You can apply for an account and a project using<br />
[http://community.haskell.org/admin/ the community server]. Ping Igloo on #haskell-hac07 and he'll create the account. You can also apply for a project.<br />
<br />
Once you have an account and a project, you upload a Darcs repository as follows. First, initialize your repository on the server:<br />
<br />
$ ssh community.haskell.org<br />
you@haskell:~$ cd /srv/code/yourproject<br />
you@haskell:/srv/code/yourproject$ darcs init<br />
<br />
Then, log out and push your repository:<br />
<br />
$ darcs push community.haskell.org:/srv/code/yourproject<br />
<br />
= Who knows about what =<br />
<br />
A list of projects you've worked on or know fairly well:<br />
<br />
{| class="wikitable"<br />
! Name<br />
! Projects<br />
|-<br />
| dons<br />
| ByteString, xmonad, Data.Binary, lambdabot, hmp3, curses, QuickCheck, HPC, hs-plugins, yi, nobench/nofib, ghc<br />
|-<br />
| Binkley<br />
| ghc, darcs (a little bit)<br />
|-<br />
| skogsbaer (Stefan Wehr)<br />
| hscurses, rhaskell<br />
|-<br />
| Pepe<br />
| ghc (front end mostly), ghci debugger, cabal-install (very little)<br />
|-<br />
| ivant<br />
| Functional MetaPost, xmonad<br />
|-<br />
| kolmodin (Lennart Kolmodin)<br />
| Data.Binary, Gentoo Linux, Haste (Haskell Turbo-Edit,a Haskell IDE in Haskell), hackport (hackage for Gentoo), hinotify, dbus-haskell <br />
|-<br />
| Heffalump (Ganesh Sittampalam)<br />
| darcs patch theory<br />
|-<br />
| [[User:Conal|conal]] (Conal Elliott)<br />
| functional reactive programming, [[DataDriven]] evaluation, tangible functional programming, graphics, embedded compilers, applicative functors, wxHaskell<br />
|}<br />
<br />
= Active Projects =<br />
Please feel free to describe your current project here!<br />
<br />
== Cabal ==<br />
<br />
== ByteString network ==<br />
<br />
Change Network.* to use strict ByteStrings instead of Strings. It would also be nice to tidy up the #ifdef mess.<br />
<br />
Current hacker(s): tibbe (Johan Tibell)<br />
<br />
== Data.Binary ==<br />
<br />
updating to 6.8<br />
<br />
Current hackers: dons<br />
<br />
== Probability monads ==<br />
<br />
A really cool existing implementation: [http://web.engr.oregonstate.edu/~erwig/pfp/ Probabilistic functional programming]<br />
<br />
[http://www.randomhacks.net/articles/2007/10/02/probability-monads-at-hac-07-ii Darcs repository and draft paper].<br />
<br />
Things to work on:<br />
<br />
# Get MaybeT into Hackage.<br />
# Is WriterT really the right monad transformer? We want the join and bind operations, but not the rest of the MonadWriter type class.<br />
# Should probabilities be represented as floats, fractions or a type class?<br />
# Can this run fast enough to be useful?<br />
<br />
Done:<br />
<br />
# [http://www.randomhacks.net/tmp/MaybeT/Control-Monad-Maybe.html MaybeT docs] and [http://code.haskell.org/maybet/ Darcs repository]. This should have all the features of [[New_monads/MaybeT]], except for the potentially ambiguous MonadPlus instance.<br />
# [http://code.haskell.org/monadrandom/ MonadRandom] is now documented and packaged.<br />
<br />
Current hacker(s): ekidd (Eric Kidd)<br />
<br />
== Yi hacking ==<br />
<br />
Yi needs a lot of love and doesn't work out of the box for me. One of the nice thing to try to do is to add the collaborative editing plugin to yi (in the spirit of the [http://gobby.0x539.de/trac/ Gobby editor]).<br />
* vincenz: Definitely would like to add some usability input here regarding Gobby functionality (having used it and having found it lacking in several areas, areas that could be improved through reusing some darcs theory).<br />
* ivant: also need to add unicode support to yi<br />
* vincenz: Move away from System.Filepath to something std supported<br />
* Cabalize the current 'Setup.hs' *Cabal hackers welcome for help*<br />
* Update the regex dependencies to work with the newest one.<br />
* Work splatch into Yi<br />
<br />
Current hacker(s): ivant (Ivan Tarasov), vincenz (Christophe Poucet)<br />
<br />
== Splatch ==<br />
Patching of splices, or otherwise said, a patch-model for working concurrently on one piece of text.<br />
<br />
Current hacker(s): ivant (Ivan Tarasov), vincenz (Christophe Poucet)<br />
<br />
== Tangible functional programming ==<br />
<br />
Some to-do items:<br />
* More built-ins<br />
* Save<br />
* Improved user experience for gestural composition, e.g., drag & drop<br />
* Does it work on MacOS? Linux?<br />
* Sum types<br />
* Code generation via hs-plugins or ghc-api or Harpy.<br />
<br />
Current hacker(s): [[User:Conal|conal]]<br />
<br />
== General composition tools ==<br />
<br />
=== Type composition & related ===<br />
<br />
[[TypeCompose]]: some classes & instances for forms of type composition (including contravariant functors and applicative functors)<br />
<br />
Current hacker(s): [[User:Conal|conal]]<br />
<br />
=== Deep arrows ===<br />
<br />
[[DeepArrow]]: a framework for composable "editors" of pure values<br />
<br />
Current hacker(s): [[User:Conal|conal]]<br />
<br />
== Source browsing ==<br />
<br />
[http://tiddlywiki.com TiddlyWiki]-based code & documentation browser. Syntax-colored and all identifiers fully hyperlinked to sources. Thanks to TiddlyWiki, the browsing experience is fluid & self-organizing.<br />
<br />
Bring together disparate functionality from HsColour & Haddock, and add auto-generated hyperlinking. Apply to all the code on Hackage.<br />
<br />
Current hacker(s): [[User:Conal|conal]]<br />
<br />
== Graphics ==<br />
<br />
Fast general, pure-Haskell image synthesis (speed of [http://conal.net/Pan Pan] or [http://conal.net/Pajama Pajama] but via ghc). Use Harpy or a new hs-plugins.<br />
<br />
Current hacker(s): [[User:Conal|conal]]<br />
<br />
== General dependency tracking & updating ==<br />
<br />
Simple, general dependency tracking & execution formulated as an [[applicative functor]] and using [[DataDriven]] computation. Applies uniformly to recompiling, re-executing, installing, compiler-recompiling, GUI specification and execution, etc. For compilation, it can give more precise (efficient) recompilation than language-specific tools (e.g., <code>hmake</code> and <code>ghc --make</code>) without being language-specific. Yields a continuous build system for free. No "make" info required (since inferred by construction). (Nontrivial language changes/improvements may be necessary.)<br />
<br />
Current hacker(s): [[User:Conal|conal]]</div>Emkhttps://wiki.haskell.org/index.php?title=Hac_2007_II/Projects&diff=16043Hac 2007 II/Projects2007-10-05T13:03:37Z<p>Emk: Added links to MaybeT stuff</p>
<hr />
<div>= Generic Information =<br />
<br />
You can apply for an account and a project using<br />
[http://community.haskell.org/admin/ the community server]. Ping Igloo on #haskell-hac07 and he'll create the account. You can also apply for a project.<br />
<br />
Once you have an account and a project, you upload a Darcs repository as follows. First, initialize your repository on the server:<br />
<br />
$ ssh community.haskell.org<br />
you@haskell:~$ cd /srv/code/yourproject<br />
you@haskell:/srv/code/yourproject$ darcs init<br />
<br />
Then, log out and push your repository:<br />
<br />
$ darcs push community.haskell.org:/srv/code/yourproject<br />
<br />
= Who knows about what =<br />
<br />
A list of projects you've worked on or know fairly well:<br />
<br />
{| class="wikitable"<br />
! Name<br />
! Projects<br />
|-<br />
| dons<br />
| ByteString, xmonad, Data.Binary, lambdabot, hmp3, curses, QuickCheck, HPC, hs-plugins, yi, nobench/nofib, ghc<br />
|-<br />
| Binkley<br />
| ghc, darcs (a little bit)<br />
|-<br />
| skogsbaer (Stefan Wehr)<br />
| hscurses, rhaskell<br />
|-<br />
| Pepe<br />
| ghc (front end mostly), ghci debugger, cabal-install (very little)<br />
|-<br />
| ivant<br />
| Functional MetaPost, xmonad<br />
|-<br />
| kolmodin (Lennart Kolmodin)<br />
| Data.Binary, Gentoo Linux, Haste (Haskell Turbo-Edit,a Haskell IDE in Haskell), hackport (hackage for Gentoo), hinotify, dbus-haskell <br />
|-<br />
| Heffalump (Ganesh Sittampalam)<br />
| darcs patch theory<br />
|-<br />
| [[User:Conal|conal]] (Conal Elliott)<br />
| functional reactive programming, [[DataDriven]] evaluation, tangible functional programming, graphics, embedded compilers, applicative functors, wxHaskell<br />
|}<br />
<br />
= Active Projects =<br />
Please feel free to describe your current project here!<br />
<br />
== Cabal ==<br />
<br />
== ByteString network ==<br />
<br />
Change Network.* to use strict ByteStrings instead of Strings. It would also be nice to tidy up the #ifdef mess.<br />
<br />
Current hacker(s): tibbe (Johan Tibell)<br />
<br />
== Probability monads ==<br />
<br />
A really cool existing implementation: [http://web.engr.oregonstate.edu/~erwig/pfp/ Probabilistic functional programming]<br />
<br />
[http://www.randomhacks.net/articles/2007/10/02/probability-monads-at-hac-07-ii Darcs repository and draft paper].<br />
<br />
Things to work on:<br />
<br />
# Get MaybeT into Hackage.<br />
# Is WriterT really the right monad transformer? We want the join and bind operations, but not the rest of the MonadWriter type class.<br />
# Should probabilities be represented as floats, fractions or a type class?<br />
# Can this run fast enough to be useful?<br />
<br />
Done:<br />
<br />
# [http://www.randomhacks.net/tmp/MaybeT/Control-Monad-Maybe.html MaybeT docs] and [http://code.haskell.org/maybet/ Darcs repository]. This should have all the features of [[New_monads/MaybeT]], except for the potentially ambiguous MonadPlus instance.<br />
<br />
Current hacker(s): ekidd (Eric Kidd)<br />
<br />
== Yi hacking ==<br />
<br />
Yi needs a lot of love and doesn't work out of the box for me. One of the nice thing to try to do is to add the collaborative editing plugin to yi (in the spirit of the [http://gobby.0x539.de/trac/ Gobby editor]).<br />
* vincenz: Definitely would like to add some usability input here regarding Gobby functionality (having used it and having found it lacking in several areas, areas that could be improved through reusing some darcs theory).<br />
* ivant: also need to add unicode support to yi<br />
* vincenz: Move away from System.Filepath to something std supported<br />
* Cabalize the current 'Setup.hs' *Cabal hackers welcome for help*<br />
* Update the regex dependencies to work with the newest one.<br />
<br />
Current hacker(s): ivant (Ivan Tarasov), vincenz (Christophe Poucet)<br />
<br />
<br />
== Tangible functional programming ==<br />
<br />
Some to-do items:<br />
* More built-ins<br />
* Save<br />
* Improved user experience for gestural composition, e.g., drag & drop<br />
* Does it work on MacOS? Linux?<br />
* Sum types<br />
* Code generation via hs-plugins or ghc-api or Harpy.<br />
<br />
Current hacker(s): [[User:Conal|conal]]<br />
<br />
== General composition tools ==<br />
<br />
=== Type composition & related ===<br />
<br />
[[TypeCompose]]: some classes & instances for forms of type composition (including contravariant functors and applicative functors)<br />
<br />
Current hacker(s): [[User:Conal|conal]]<br />
<br />
=== Deep arrows ===<br />
<br />
[[DeepArrow]]: a framework for composable "editors" of pure values<br />
<br />
Current hacker(s): [[User:Conal|conal]]<br />
<br />
== Source browsing ==<br />
<br />
[http://tiddlywiki.com TiddlyWiki]-based code & documentation browser. Syntax-colored and all identifiers fully hyperlinked to sources. Thanks to TiddlyWiki, the browsing experience is fluid & self-organizing.<br />
<br />
Bring together disparate functionality from HsColour & Haddock, and add auto-generated hyperlinking. Apply to all the code on Hackage.<br />
<br />
Current hacker(s): [[User:Conal|conal]]<br />
<br />
== Graphics ==<br />
<br />
Fast general, pure-Haskell image synthesis (speed of [http://conal.net/Pan Pan] or [http://conal.net/Pajama Pajama] but via ghc). Use Harpy or a new hs-plugins.<br />
<br />
Current hacker(s): [[User:Conal|conal]]<br />
<br />
== General dependency tracking & updating ==<br />
<br />
Simple, general dependency tracking & execution formulated as an [[applicative functor]] and using [[DataDriven]] computation. Applies uniformly to recompiling, re-executing, installing, compiler-recompiling, GUI specification and execution, etc. For compilation, it can give more precise (efficient) recompilation than language-specific tools (e.g., <code>hmake</code> and <code>ghc --make</code>) without being language-specific. Yields a continuous build system for free. No "make" info required (since inferred by construction). (Nontrivial language changes/improvements may be necessary.)<br />
<br />
Current hacker(s): [[User:Conal|conal]]</div>Emkhttps://wiki.haskell.org/index.php?title=Hac_2007_II/Projects&diff=16041Hac 2007 II/Projects2007-10-05T12:20:43Z<p>Emk: Repository setup instructions</p>
<hr />
<div>= Generic Information =<br />
<br />
You can apply for an account and a project using<br />
[http://community.haskell.org/admin/ the community server]. Ping Igloo on #haskell-hac07 and he'll create the account. You can also apply for a project.<br />
<br />
Once you have an account and a project, you upload a Darcs repository as follows. First, initialize your repository on the server:<br />
<br />
$ ssh community.haskell.org<br />
you@haskell:~$ cd /srv/code/yourproject<br />
you@haskell:/srv/code/yourproject$ darcs init<br />
<br />
Then, log out and push your repository:<br />
<br />
$ darcs push community.haskell.org:/srv/code/yourproject<br />
<br />
= Who knows about what =<br />
<br />
A list of projects you've worked on or know fairly well:<br />
<br />
{| class="wikitable"<br />
! Name<br />
! Projects<br />
|-<br />
| dons<br />
| ByteString, xmonad, Data.Binary, lambdabot, hmp3, curses, QuickCheck, HPC, hs-plugins, yi, nobench/nofib, ghc<br />
|-<br />
| Binkley<br />
| ghc, darcs (a little bit)<br />
|-<br />
| skogsbaer (Stefan Wehr)<br />
| hscurses, rhaskell<br />
|-<br />
| Pepe<br />
| ghc (front end mostly), ghci debugger, cabal-install (very little)<br />
|-<br />
| ivant<br />
| Functional MetaPost, xmonad<br />
|-<br />
| kolmodin (Lennart Kolmodin)<br />
| Data.Binary, Gentoo Linux, Haste (Haskell Turbo-Edit,a Haskell IDE in Haskell), hackport (hackage for Gentoo), hinotify, dbus-haskell <br />
|-<br />
| Heffalump (Ganesh Sittampalam)<br />
| darcs patch theory<br />
|-<br />
| [[User:Conal|conal]] (Conal Elliott)<br />
| functional reactive programming, [[DataDriven]] evaluation, tangible functional programming, graphics, embedded compilers, applicative functors, wxHaskell<br />
|}<br />
<br />
= Active Projects =<br />
Please feel free to describe your current project here!<br />
<br />
== Cabal ==<br />
<br />
== ByteString network ==<br />
<br />
Change Network.* to use strict ByteStrings instead of Strings. It would also be nice to tidy up the #ifdef mess.<br />
<br />
Current hacker(s): tibbe (Johan Tibell)<br />
<br />
== Probability monads ==<br />
<br />
A really cool existing implementation: [http://web.engr.oregonstate.edu/~erwig/pfp/ Probabilistic functional programming]<br />
<br />
[http://www.randomhacks.net/articles/2007/10/02/probability-monads-at-hac-07-ii Darcs repository and draft paper].<br />
<br />
Things to work on:<br />
<br />
# Get MaybeT into Hackage.<br />
# Is WriterT really the right monad transformer? We want the join and bind operations, but not the rest of the MonadWriter type class.<br />
# Should probabilities be represented as floats, fractions or a type class?<br />
# Can this run fast enough to be useful?<br />
<br />
Current hacker(s): ekidd (Eric Kidd)<br />
<br />
== Yi hacking ==<br />
<br />
Yi needs a lot of love and doesn't work out of the box for me. One of the nice thing to try to do is to add the collaborative editing plugin to yi (in the spirit of the [http://gobby.0x539.de/trac/ Gobby editor]).<br />
* vincenz: Definitely would like to add some usability input here regarding Gobby functionality (having used it and having found it lacking in several areas, areas that could be improved through reusing some darcs theory).<br />
* ivant: also need to add unicode support to yi<br />
* vincenz: Move away from System.Filepath to something std supported<br />
* Cabalize the current 'Setup.hs' *Cabal hackers welcome for help*<br />
<br />
Current hacker(s): ivant (Ivan Tarasov), vincenz (Christophe Poucet)<br />
<br />
<br />
== Tangible functional programming ==<br />
<br />
Some to-do items:<br />
* More built-ins<br />
* Save<br />
* Improved user experience for gestural composition, e.g., drag & drop<br />
* Does it work on MacOS? Linux?<br />
* Sum types<br />
* Code generation via hs-plugins or ghc-api or Harpy.<br />
<br />
Current hacker(s): [[User:Conal|conal]]<br />
<br />
== General composition tools ==<br />
<br />
=== Type composition & related ===<br />
<br />
[[TypeCompose]]: some classes & instances for forms of type composition (including contravariant functors and applicative functors)<br />
<br />
Current hacker(s): [[User:Conal|conal]]<br />
<br />
=== Deep arrows ===<br />
<br />
[[DeepArrow]]: a framework for composable "editors" of pure values<br />
<br />
Current hacker(s): [[User:Conal|conal]]<br />
<br />
== Source browsing ==<br />
<br />
[http://tiddlywiki.com TiddlyWiki]-based code & documentation browser. Syntax-colored and all identifiers fully hyperlinked to sources. Thanks to TiddlyWiki, the browsing experience is fluid & self-organizing.<br />
<br />
Bring together disparate functionality from HsColour & Haddock, and add auto-generated hyperlinking. Apply to all the code on Hackage.<br />
<br />
Current hacker(s): [[User:Conal|conal]]<br />
<br />
== Graphics ==<br />
<br />
Fast general, pure-Haskell image synthesis (speed of [http://conal.net/Pan Pan] or [http://conal.net/Pajama Pajama] but via ghc). Use Harpy or a new hs-plugins.<br />
<br />
Current hacker(s): [[User:Conal|conal]]<br />
<br />
== General dependency tracking & updating ==<br />
<br />
Simple, general dependency tracking & execution formulated as an [[applicative functor]] and using [[DataDriven]] computation. Applies uniformly to recompiling, re-executing, installing, compiler-recompiling, GUI specification and execution, etc. For compilation, it can give more precise (efficient) recompilation than language-specific tools (e.g., <code>hmake</code> and <code>ghc --make</code>) without being language-specific. Yields a continuous build system for free. No "make" info required (since inferred by construction). (Nontrivial language changes/improvements may be necessary.)<br />
<br />
Current hacker(s): [[User:Conal|conal]]</div>Emkhttps://wiki.haskell.org/index.php?title=Hac_2007_II/Projects&diff=16025Hac 2007 II/Projects2007-10-05T10:47:44Z<p>Emk: Added instructions on getting an account</p>
<hr />
<div>= Generic Information =<br />
<br />
You can apply for an account and a project using<br />
[http://community.haskell.org/admin/ the community server]. Ping Igloo on #haskell-hac07 and he'll create the account.<br />
<br />
Instructions for setting up repositories go here...<br />
<br />
= Who knows about what =<br />
<br />
A list of projects you've worked on or know fairly well:<br />
<br />
{| class="wikitable"<br />
! Name<br />
! Projects<br />
|-<br />
| dons<br />
| ByteString, xmonad, Data.Binary, lambdabot, hmp3, curses, QuickCheck, HPC, hs-plugins, yi, nobench/nofib, ghc<br />
|-<br />
| Binkley<br />
| ghc, darcs (a little bit)<br />
|-<br />
| skogsbaer (Stefan Wehr)<br />
| hscurses, rhaskell<br />
|-<br />
| Pepe<br />
| ghc (front end mostly), ghci debugger, cabal-install (very little)<br />
|-<br />
| ivant<br />
| Functional MetaPost, xmonad<br />
|-<br />
| kolmodin (Lennart Kolmodin)<br />
| Data.Binary, Gentoo Linux, Haste (Haskell Turbo-Edit,a Haskell IDE in Haskell), hackport (hackage for Gentoo), hinotify, dbus-haskell <br />
|-<br />
|}<br />
<br />
= Active Projects =<br />
Please feel free to describe your current project here!<br />
<br />
== Cabal ==<br />
<br />
== ByteString network ==<br />
<br />
Change Network.* to use strict ByteStrings instead of Strings. It would also be nice to tidy up the #ifdef mess.<br />
<br />
Current hacker(s): tibbe (Johan Tibell)<br />
<br />
== Probability monads ==<br />
<br />
A really cool existing implementation: [http://web.engr.oregonstate.edu/~erwig/pfp/ Probabilistic functional programming]<br />
<br />
[http://www.randomhacks.net/articles/2007/10/02/probability-monads-at-hac-07-ii Darcs repository and draft paper].<br />
<br />
Things to work on:<br />
<br />
# Get MaybeT into Hackage.<br />
# Is WriterT really the right monad transformer? We want the join and bind operations, but not the rest of the MonadWriter type class.<br />
# Should probabilities be represented as floats, fractions or a type class?<br />
# Can this run fast enough to be useful?<br />
<br />
Current hacker(s): ekidd (Eric Kidd)</div>Emkhttps://wiki.haskell.org/index.php?title=Hac_2007_II/Attendees&diff=16023Hac 2007 II/Attendees2007-10-05T10:27:36Z<p>Emk: Moved some information to Projects...</p>
<hr />
<div>[[Image:Hac-axe-icon.png|Hac icon]]<br />
<br />
== Projects ==<br />
<br />
See [[Hac_2007_II/Projects]].<br />
<br />
== Registrants ==<br />
<br />
If you've registered, do add your name to the following table:<br />
<br />
{| class="wikitable"<br />
! Name<br />
! Nick<br />
! Affiliiation<br />
! Provided tshirt size<br />
! Mobile #<br />
|-<br />
| [http://www.cse.unsw.edu.au/~dons Don Stewart]<br />
| dons<br />
| Galois<br />
| Yes<br />
|<br />
|-<br />
| Ian Lynagh<br />
| Igloo<br />
|<br />
| Yes<br />
|<br />
|-<br />
| Duncan Coutts<br />
| dcoutts<br />
| Oxford<br />
| Yes<br />
|<br />
|-<br />
| Lennart Kolmodin<br />
| kolmodin<br />
| Chalmers<br />
| Yes<br />
| +46736223606<br />
|-<br />
| Pepe Iborra<br />
| mnislaih<br />
| UPV<br />
| Yes<br />
|<br />
|-<br />
| Ben Lippmeier<br />
| benl23<br />
| ANU<br />
| Yes<br />
|<br />
|-<br />
| David Himmelstrup<br />
| Lemmih<br />
|<br />
| Yes<br />
|<br />
|- <br />
| [http://www.bringert.net/ Björn Bringert]<br />
| bringert<br />
| Chalmers <br />
| Yes<br />
| +46704779794<br />
|-<br />
| Tim Chevalier<br />
| Binkley<br />
| PSU<br />
| Yes<br />
|<br />
|-<br />
| Andy Gill<br />
| andyjgill<br />
| Galois<br />
| Yes<br />
|<br />
|-<br />
| Clemens Fruhwirth<br />
| therp<br />
| <br />
| Yes<br />
|<br />
|-<br />
| Thorkil Naur<br />
| naur<br />
|<br />
| Yes<br />
|<br />
|-<br />
| Benedikt Schmidt<br />
| beschmi<br />
|<br />
| Yes<br />
|<br />
|-<br />
| Thomas Schilling<br />
| nominolo<br />
|<br />
| Yes<br />
|<br />
|-<br />
| Conal Elliott<br />
| conal<br />
|<br />
| Yes<br />
|<br />
|-<br />
| Russell O'Connor<br />
| roconnor<br />
|<br />
| Yes<br />
| +31625178046<br />
|-<br />
| Ganesh Sittampalam<br />
| Heffalump<br />
| Credit Suisse<br />
| Yes<br />
|<br />
|-<br />
| Jürgen Nicklisch<br />
| Jutaro<br />
|<br />
| Yes<br />
|<br />
|-<br />
| Ivan Tarasov<br />
| ivant<br />
|<br />
| Yes<br />
|<br />
|-<br />
| Johan Tibell<br />
| tibbe<br />
|<br />
| Yes<br />
|<br />
|-<br />
| Clifford Beshers<br />
| thetallguy<br />
|<br />
| Yes<br />
|<br />
|-<br />
| David Fox<br />
| dsf<br />
| <br />
| Yes<br />
|<br />
|-<br />
| [http://www.esat.kuleuven.ac.be/~cpoucet Christophe Poucet]<br />
| vincenz<br />
| IMEC<br />
| Yes<br />
|<br />
|-<br />
| Matthias Neubauer<br />
| heckenpenner<br />
| Freiburg<br />
| Yes<br />
|<br />
|-<br />
| Stefan Wehr<br />
| <br />
| Freiburg<br />
| Yes<br />
|<br />
|-<br />
| [http://www.randomhacks.net/ Eric Kidd]<br />
| ekidd<br />
| Dartmouth<br />
| Yes<br />
| 15776874941<br />
|-<br />
| Marcus Uneson<br />
| muneson<br />
| <br />
| Yes<br />
|<br />
|-<br />
| Conrad Barski<br />
| drcode<br />
| <br />
| Yes<br />
| [http://lisperati.com/haskell/ My Brand New Haskell Tutorial :-)]<br />
|-<br />
| Joachim Breitner<br />
| nomeata<br />
| <br />
| Yes<br />
|<br />
|}<br />
<br />
== Arriving ==<br />
<br />
===Train===<br />
<br />
* Igloo: 29 Sep at 21:00, Freiburg Hbf.<br />
* Lemmih: 29 Sep at 18:00, Freiburg Hbf.<br />
* Jutaro: 29 Sep at 23:09, Freiburg Hbf.<br />
* ivant: 30 Sep, at 8:00, from Vienna<br />
* tibbe: 5 Oct, at 8:00, from Zurich<br />
* vincenz: 4 Oct, At 23-24, Freiburg Hbf.<br />
* roconnor: 4 Oct, at 21:00, Freiburg Hbf.<br />
<br />
===Air===<br />
<br />
* Andy Gill, 29 Sep Frankfurt<br />
* Don Stewart, 29 Sep 8.35 am, Frankfurt<br />
* Thomas Schilling, 29 Sep Frankfurt Main<br />
* Conal Elliott, 25 Sep 11:10 am, Frankfurt<br />
* Ganesh Sittampalam, 29 Sep 2:50 pm, Zurich<br />
* Pepe Iborra, 29 Sep 8:40 pm, Frankfurt Hahn (HHN)<br />
* Lennart Kolmodin, 29 Sep, 12:05, Frankfurt<br />
* Björn Bringert, 04 Oct 18:55, Frankfurt (train to Freiburg dep 19.54, arr 22:15)<br />
<br />
== Accomodation ==<br />
<br />
A number of accommodation options are available. To organize to share,<br />
contact other attendees on irc or via email. <br />
<br />
=== Black Forest Hostel ===<br />
<br />
Some people are staying at the hostel: http://www.blackforest-hostel.de/<br />
<br />
* Igloo, Lemmih, nominolo: 29 Sep - 8 Oct<br />
* conal: same, in a 6-bed dorm room, 25 Sep - 8 Oct<br />
* ivant: same, 30 Sep - 8 Oct<br />
* tibbe: 6-bed dorm room, 5 Oct - 7 Oct<br />
* mnislaih: same<br />
* dcoutts, kolmodin: 6-bed dorm room, 29 Sep - 8 Oct<br />
* drcode<br />
* roconnor: dorm room, 4 Oct - 8 Oct (still to be confirmed)<br />
<br />
We will be meeting at 9am at the entrance of the Black Forest Hostel to go to the Hackathon venue.<br />
<br />
=== Best Western ===<br />
<br />
* dons, andy: Best Western<br />
<br />
=== InterCityHotel ===<br />
<br />
http://www.booking.com/hotel/de/intercityhotelfreiburg.html<br />
<br />
* bringert, vincenz: 04 Oct - 07 Oct<br />
<br />
=== Paradies ===<br />
<br />
* jutaro: 01 Oct - 07 Oct</div>Emkhttps://wiki.haskell.org/index.php?title=Hac_2007_II/Projects&diff=16022Hac 2007 II/Projects2007-10-05T10:26:50Z<p>Emk: Moved content from Attendees page</p>
<hr />
<div>= Generic Information =<br />
How to create repositories...<br />
<br />
= Who knows about what =<br />
<br />
A list of projects you've worked on or know fairly well:<br />
<br />
{| class="wikitable"<br />
! Name<br />
! Projects<br />
|-<br />
| dons<br />
| ByteString, xmonad, Data.Binary, lambdabot, hmp3, curses, QuickCheck, HPC, hs-plugins, yi, nobench/nofib, ghc<br />
|-<br />
| Binkley<br />
| ghc, darcs (a little bit)<br />
|-<br />
| skogsbaer (Stefan Wehr)<br />
| hscurses, rhaskell<br />
|-<br />
| Pepe<br />
| ghc (front end mostly), ghci debugger, cabal-install (very little)<br />
|-<br />
| ivant<br />
| Functional MetaPost, xmonad<br />
|-<br />
| kolmodin (Lennart Kolmodin)<br />
| Data.Binary, Gentoo Linux, Haste (Haskell Turbo-Edit,a Haskell IDE in Haskell), hackport (hackage for Gentoo), hinotify, dbus-haskell <br />
|-<br />
|}<br />
<br />
= Active Projects =<br />
Please feel free to describe your current project here!<br />
<br />
== Cabal ==<br />
<br />
== ByteString network ==<br />
<br />
Change Network.* to use strict ByteStrings instead of Strings. It would also be nice to tidy up the #ifdef mess.<br />
<br />
Current hacker(s): tibbe (Johan Tibell)<br />
<br />
== Probability monads ==<br />
<br />
A really cool existing implementation: [http://web.engr.oregonstate.edu/~erwig/pfp/ Probabilistic functional programming]<br />
<br />
[http://www.randomhacks.net/articles/2007/10/02/probability-monads-at-hac-07-ii Darcs repository and draft paper].<br />
<br />
Things to work on:<br />
<br />
# Get MaybeT into Hackage.<br />
# Is WriterT really the right monad transformer? We want the join and bind operations, but not the rest of the MonadWriter type class.<br />
# Should probabilities be represented as floats, fractions or a type class?<br />
# Can this run fast enough to be useful?<br />
<br />
Current hacker(s): ekidd (Eric Kidd)</div>Emkhttps://wiki.haskell.org/index.php?title=Hac_2007_II/Projects&diff=16019Hac 2007 II/Projects2007-10-05T10:21:29Z<p>Emk: Links to more resources</p>
<hr />
<div>= Generic Information =<br />
How to create repositories...<br />
<br />
= Active Projects =<br />
Please feel free to describe your current project here!<br />
<br />
== Cabal ==<br />
<br />
== ByteString network ==<br />
<br />
Change Network.* to use strict ByteStrings instead of Strings. It would also be nice to tidy up the #ifdef mess.<br />
<br />
Current hacker(s): tibbe (Johan Tibell)<br />
<br />
== Probability monads ==<br />
<br />
A really cool existing implementation: [http://web.engr.oregonstate.edu/~erwig/pfp/ Probabilistic functional programming]<br />
<br />
[http://www.randomhacks.net/articles/2007/10/02/probability-monads-at-hac-07-ii Darcs repository and draft paper].<br />
<br />
Things to work on:<br />
<br />
# Get MaybeT into Hackage.<br />
# Is WriterT really the right monad transformer? We want the join and bind operations, but not the rest of the MonadWriter type class.<br />
# Should probabilities be represented as floats, fractions or a type class?<br />
# Can this run fast enough to be useful?<br />
<br />
Current hacker(s): ekidd (Eric Kidd)</div>Emkhttps://wiki.haskell.org/index.php?title=Hac_2007_II/Projects&diff=16018Hac 2007 II/Projects2007-10-05T10:18:44Z<p>Emk: Described probability monad stuff</p>
<hr />
<div>= Generic Information =<br />
How to create repositories...<br />
<br />
= Active Projects =<br />
Please feel free to describe your current project here!<br />
<br />
== Cabal ==<br />
<br />
== ByteString network ==<br />
<br />
Change Network.* to use strict ByteStrings instead of Strings. It would also be nice to tidy up the #ifdef mess.<br />
<br />
Current hacker(s): tibbe (Johan Tibell)<br />
<br />
== Probability monads ==<br />
<br />
Things to work on:<br />
<br />
# Get MaybeT into Hackage.<br />
# Is WriterT really the right monad transformer? We want the join and bind operations, but not the rest of the MonadWriter type class.<br />
# Should probabilities be represented as floats, fractions or a type class?<br />
# Can this run fast enough to be useful?<br />
<br />
Current hacker(s): ekidd (Eric Kidd)</div>Emkhttps://wiki.haskell.org/index.php?title=Hac_2007_II/Projects&diff=16013Hac 2007 II/Projects2007-10-05T10:13:48Z<p>Emk: Added some section headings</p>
<hr />
<div>Please feel free to describe your current project here!<br />
<br />
== Cabal ==<br />
<br />
== Probability monads ==</div>Emkhttps://wiki.haskell.org/index.php?title=Hac_2007_II/Projects&diff=16012Hac 2007 II/Projects2007-10-05T10:11:53Z<p>Emk: Created Projects page.</p>
<hr />
<div>Please feel free to describe your current project here!</div>Emkhttps://wiki.haskell.org/index.php?title=Hac_2007_II&diff=16009Hac 2007 II2007-10-05T10:10:50Z<p>Emk: Added link to a "Projects" page</p>
<hr />
<div>[[Image:Freiburg-lambda.png|Hac 07 II|center]]<br />
<br />
[[Image:Hac-axe-icon.png|Hac icon]]<br />
<br />
'''Hac 07 II: Haskell Hackathon'''<br />
<br />
'''October 5-7, 2007'''<br />
<br />
'''University of Freiburg, Freiburg, Germany'''<br />
<br />
* [[/Register|Register for the Hackathon]]<br />
<br />
* [[/Attendees|Attendees organising page]]<br />
<br />
* [[/Projects|What we're working on]]<br />
<br />
The 3rd Haskell Hackathon will be held over 3 days, October 5-7 2007,<br />
at the University of Freiburg, in conjunction with the<br />
[http://www.cse.unsw.edu.au/~keller/haskellws/HaskellWorkshop.html Haskell Workshop] and<br />
[http://www.informatik.uni-bonn.de/~ralf/icfp07.html ICFP] 2007.<br />
It is a coding festival, focusing on producing and improving<br />
Haskell libraries, tools and infrastructure.<br />
<br />
To attend please [[/Register|register]], and get ready to hack!<br />
<br />
''Note: that it is not necessary to register for ICFP, or any of the associated conferences, if you only want to go to the Hackathon. The Hackathon itself will be '''free''', but you will have to pay for travel, accommodation and food.''<br />
<br />
== Registration ==<br />
<br />
If you will be attending add your name to the [[/Register|Registration page]].<br />
Numbers may be limited, depending on availablity of space.<br />
<br />
== Where ==<br />
<br />
The Hackathon will take place at the same venue as the IFL workshop, at<br />
[http://maps.google.com/maps/ms?ie=UTF8&hl=en&msa=0&om=1&msid=112565914073914710272.0000011293bc4c0bc450c&ll=47.999169,7.86046&spn=0.041064,0.078621&z=14 the Faculty of Applied Sciences] of the University of Freiburg. '''The room is 02-016 in building 101'''.<br />
<br />
You can reach the hackathon venue from the main train station by taking the "Breisgau S-Bahn" from "Freiburg - Hbf." to "FR Messe/Universitt". [http://proglang.informatik.uni-freiburg.de/IFL2007/timetable.pdf Here is a timetable] (pdf). Please note that most but not all trains stop at the hackathon venue. Also, some trains only run Monday to Friday ("Montag - Freitag") or on Saturday ("Samstag").<br />
<br />
Alternatively, you can walk from the city center to the hackathon (20 - 30 minutes). [http://maps.google.com/maps/ms?ie=UTF8&hl=en&msa=0&om=1&msid=112565914073914710272.0000011293bc4c0bc450c&ll=47.999169,7.86046&spn=0.041064,0.078621&z=14 The map] shows the exact route. <br />
[[Image:logo-klein-07-2.png|frame|]]<br />
<br />
The Hackathon will be integrated with the university [http://sommercampus2007.informatik.uni-freiburg.de/WikiAbstract summer campus]. This will give us all the infrastructure (room, Internet, etc) at minimal hassle. '''Note:''' There won't be any stationary PCs, so you should bring a laptop with you.<br />
<br />
=== Local information ===<br />
<br />
For local information (travel, accommodation etc) see the<br />
[http://proglang.informatik.uni-freiburg.de/ICFP2007/ ICFP local info page].<br />
<br />
[http://proglang.informatik.uni-freiburg.de/IFL2007/travel-information.shtml Travel information page]<br />
<br />
Airport maps:<br />
* [http://maps.google.com/maps/ms?ie=UTF8&hl=en&msa=0&ll=48.705463,9.876709&spn=4.945094,10.063477&z=7&om=1&msid=112565914073914710272.000001129e6f892b7a21e Airports]<br />
<br />
== Dates ==<br />
<br />
Hac 2007 II will take place on Fri 5 Oct to Sun 7 Oct. The following<br />
table shows the workshops and conferences held in Freiburg during the<br />
ICFP period:<br />
<br />
{| class="wikitable"<br />
|-<br />
|Date || Events<br />
|-<br />
|Thu 27 Sep || IFL<br />
|-<br />
|Fri 28 Sep || IFL<br />
|-<br />
|Sat 29 Sep || IFL<br />
|-<br />
|Sun 30 Sep || HW, Scheme<br />
|-<br />
|Mon 1 Oct || ICFP<br />
|-<br />
|Tue 2 Oct || ICFP<br />
|-<br />
|Wed 3 Oct || ICFP<br />
|-<br />
|Thu 4 Oct || CUFP, MM<br />
|-<br />
|Fri 5 Oct || '''Hac 2007 II''', Erlang, ML, PV<br />
|-<br />
|Sat 6 Oct || '''Hac 2007 II'''<br />
|-<br />
|Sun 7 Oct || '''Hac 2007 II'''<br />
|}<br />
<br />
The Hackathon will, ''tentatively'', be held from 10am to 6pm each day,<br />
with dinner after at local venues.<br />
<br />
== Facilities ==<br />
<br />
=== What to bring ===<br />
<br />
* A laptop<br />
* Wireless cards<br />
* Power adaptors if necessary<br />
* Ethernet cable<br />
* Mobile phone<br />
<br />
=== Before you arrive ===<br />
<br />
* Pick out a couple of projects to work on and familiarise yourself with them<br />
* Install an up to date Haskell toolchain (ghc-6.6.1 and if you like a recent snapshot of ghc-6.8.0 also).<br />
<br />
== Projects to work on ==<br />
<br />
Add ideas here for which you think hacking together as a group (rather<br />
than individually) would be beneficial.<br />
<br />
=== Group projects ===<br />
<br />
* Building tests that give 100% code coverage for package base.<br />
* Lots of Cabal hacking still to be done<br />
* Bindings for <your favourite C library><br />
* Haskell library for <your favourite task><br />
* Ensure hackage is ready for ghc 6.8<br />
<br />
=== Other things ===<br />
<br />
* Bit layer on Data.Binary 1.0<br />
* libxml<br />
* bytestring parsec<br />
* combine strictcheck and quickcheck once and for all<br />
* darcs hacking<br />
* aggressive inlining for mtl?<br />
* Data.ByteString.Sequence - a ropes-alike lib based on specialised finger trees<br />
* Data.ByteString.Rope, based on<br />
* [http://www.sgi.com/tech/stl/ropeimpl.html SGIs ropes] or [http://groups.google.com/group/fa.caml/browse_frm/thread/4e70beff0f714229/ new ocaml ropes]<br />
* bit parsing layer for Data.Binary and a network protocol demo?<br />
* dons: HPC coverage for bytestring 1.0<br />
* pretty printer-based ncurses interface<br />
* integrate darcs-piegraph and darcs-graph<br />
* improve the performance of DiffArray using modern techniques [http://www.lri.fr/~filliatr/ftp/ocaml/ds/parray.ml.html OCaml impl]. <br />
** vincenz: Note that even underneath the hood, the ocaml impl is using impurity to implement this (namely the modification of the array in Diff)<br />
* New [http://www.cse.unsw.edu.au/~dons/hs-plugins hs-plugins] on top of ghc-api. [[User:Conal|Conal]]<br />
* Fast general, pure-Haskell image synthesis (speed of [http://conal.net/Pan Pan] or [http://conal.net/Pajama Pajama] but via ghc). Use Harpy or a new hs-plugins. [[User:Conal|Conal]] <br />
* [http://tiddlywiki.com TiddlyWiki]-based code & documentation browser. Syntax-colored and all identifiers fully hyperlinked to sources. Thanks to TiddlyWiki, the browsing experience is fluid & self-organizing. [[User:Conal|Conal]]<br />
* Fix the Network.Socket API (at least to allow <code>setSocketOption x RecvTimeOut</code> and <code>SendTimeOut</code>)<br />
* Haskell WSGI (http://www.python.org/dev/peps/pep-0333/) equivalent with a reference server implementation.<br />
* [http://haskell.org/haskellwiki/UnicodeByteString UnicodeByteString] layer (<code>Text.UnicodeString</code> maybe).<br />
* ByteString network API.<br />
* ByteString simple HTTP<br />
* Library to allow Haskell to communicate with Erlang processes using the Erlang message protocol.<br />
* A better curses rss client than snownews: support ^L resize signal, and parallel feed downloading.<br />
* benl23: Optimize new graph colouring register allocator.<br />
* jutaro: Information extraction for a Haskell IDE (Types,Completion,Navigation)<br />
* ivant: fix [http://cryp.to/funcmp/ Functional MetaPost] (figure out the problems of using it from LaTeX, add definitions for using it from ConTeXt, etc.)<br />
* vincenz: Trie implementation with a similar interface to Map<br />
* Possibility to turn logging on/off in lambdabot per channel<br />
* Continuous build system, via as simple, general dependency tracking & execution formulated as an [[applicative functor]] and using [[DataDriven]] computation. No "make" info required (since inferred by construction). Applies uniformly to recompiling, re-executing, installing, compiler-recompiling, GUI specification and execution, etc. For compilation, it can give more precise (efficient) recompilation than language-specific tools (e.g., <code>hmake</code> and <code>ghc --make</code>) without being language-specific. [[User:Conal|Conal]] 13:51, 1 October 2007 (UTC)<br />
<br />
== Organisers ==<br />
<br />
The organisers for the Hackathon are:<br />
<br />
* [http://progtools.comlab.ox.ac.uk/members/duncan Duncan Coutts]<br />
* [mailto:igloo@earth.li Ian Lynagh]<br />
* [http://www.cse.unsw.edu.au/~dons Don Stewart] <br />
<br />
The organisers can be contacted via: <br />
<br />
dons.hac07@cse.unsw.edu.au<br />
<br />
The local organisers in Freiburg:<br />
<br />
* [http://www.informatik.uni-freiburg.de/~wehr/ Stefan Wehr] <br />
* Phillip Heidegger<br />
<br />
Courtesy of the<br />
[http://proglang.informatik.uni-freiburg.de/ICFP2007/local-organizers.shtml Programming Languages Group] at the University of Freiburg.<br />
<br />
== IRC channel ==<br />
<br />
A Hackathon [[IRC channel]] has been set up. Visit:<br />
<br />
#haskell-hac07<br />
<br />
on Freenode.<br />
<br />
== Previous Haskell hackathons ==<br />
<br />
* [[Hac_2007|Hac 2007 - Oxford]]<br />
* [http://hackage.haskell.org/trac/ghc/wiki/Hackathon Hac 2006 - Portland]<br />
<br />
== Related events ==<br />
<br />
Hac 07 II is (unofficially) colocated with ICFP and other conferences:<br />
<br />
{|<br />
!<br />
!<br />
|-<br />
| [http://proglang.informatik.uni-freiburg.de/IFL2007/ IFL]<br />
| September 27-29<br />
|-<br />
| [http://www.cse.unsw.edu.au/~keller/haskellws/HaskellWorkshop.html Haskell Workshop]<br />
| September 30<br />
|-<br />
| [http://www.informatik.uni-bonn.de/~ralf/icfp07.html ICFP] <br />
| October 1-3<br />
|-<br />
| [http://cufp.galois.com/ CUFP] <br />
| October 4<br />
|-<br />
|}<br />
<br />
== Questions ==<br />
<br />
* AJG: What can Galois do to help?<br />
* If there's anything that Credit Suisse can do to support the Hackathon, please let me know - [mailto:howard.mansell@credit-suisse.com]<br />
<br />
== Misc ==<br />
<br />
The Freiburg background is [http://en.wikipedia.org/wiki/Image:Friburgo_-_Freiburg.jpg available] under the GNU Free Documentation License, from wikipedia.<br />
<br />
[[Category:Community]]<br />
[[Category:Events]]</div>Emkhttps://wiki.haskell.org/index.php?title=Hac_2007_II/Attendees&diff=16004Hac 2007 II/Attendees2007-10-05T08:35:17Z<p>Emk: Added phone number</p>
<hr />
<div>[[Image:Hac-axe-icon.png|Hac icon]]<br />
<br />
== Registrants ==<br />
<br />
If you've registered, do add your name to the following table:<br />
<br />
{| class="wikitable"<br />
! Name<br />
! Nick<br />
! Affiliiation<br />
! Provided tshirt size<br />
! Mobile #<br />
|-<br />
| [http://www.cse.unsw.edu.au/~dons Don Stewart]<br />
| dons<br />
| Galois<br />
| Yes<br />
|<br />
|-<br />
| Ian Lynagh<br />
| Igloo<br />
|<br />
| Yes<br />
|<br />
|-<br />
| Duncan Coutts<br />
| dcoutts<br />
| Oxford<br />
| Yes<br />
|<br />
|-<br />
| Lennart Kolmodin<br />
| kolmodin<br />
| Chalmers<br />
| Yes<br />
| +46736223606<br />
|-<br />
| Pepe Iborra<br />
| mnislaih<br />
| UPV<br />
| Yes<br />
|<br />
|-<br />
| Ben Lippmeier<br />
| benl23<br />
| ANU<br />
| Yes<br />
|<br />
|-<br />
| David Himmelstrup<br />
| Lemmih<br />
|<br />
| Yes<br />
|<br />
|- <br />
| [http://www.bringert.net/ Björn Bringert]<br />
| bringert<br />
| Chalmers <br />
| Yes<br />
| +46704779794<br />
|-<br />
| Tim Chevalier<br />
| Binkley<br />
| PSU<br />
| Yes<br />
|<br />
|-<br />
| Andy Gill<br />
| andyjgill<br />
| Galois<br />
| Yes<br />
|<br />
|-<br />
| Clemens Fruhwirth<br />
| therp<br />
| <br />
| Yes<br />
|<br />
|-<br />
| Thorkil Naur<br />
| naur<br />
|<br />
| Yes<br />
|<br />
|-<br />
| Benedikt Schmidt<br />
| beschmi<br />
|<br />
| Yes<br />
|<br />
|-<br />
| Thomas Schilling<br />
| nominolo<br />
|<br />
| Yes<br />
|<br />
|-<br />
| Conal Elliott<br />
| conal<br />
|<br />
| Yes<br />
|<br />
|-<br />
| Russell O'Connor<br />
| roconnor<br />
|<br />
| Yes<br />
| +31625178046<br />
|-<br />
| Ganesh Sittampalam<br />
| Heffalump<br />
| Credit Suisse<br />
| Yes<br />
|<br />
|-<br />
| Jürgen Nicklisch<br />
| Jutaro<br />
|<br />
| Yes<br />
|<br />
|-<br />
| Ivan Tarasov<br />
| ivant<br />
|<br />
| Yes<br />
|<br />
|-<br />
| Johan Tibell<br />
| tibbe<br />
|<br />
| Yes<br />
|<br />
|-<br />
| Clifford Beshers<br />
| thetallguy<br />
|<br />
| Yes<br />
|<br />
|-<br />
| David Fox<br />
| dsf<br />
| <br />
| Yes<br />
|<br />
|-<br />
| [http://www.esat.kuleuven.ac.be/~cpoucet Christophe Poucet]<br />
| vincenz<br />
| IMEC<br />
| Yes<br />
|<br />
|-<br />
| Matthias Neubauer<br />
| heckenpenner<br />
| Freiburg<br />
| Yes<br />
|<br />
|-<br />
| Stefan Wehr<br />
| <br />
| Freiburg<br />
| Yes<br />
|<br />
|-<br />
| [http://www.randomhacks.net/ Eric Kidd]<br />
| ekidd<br />
| Dartmouth<br />
| Yes<br />
| 15776874941<br />
|-<br />
| Marcus Uneson<br />
| muneson<br />
| <br />
| Yes<br />
|<br />
|-<br />
| Conrad Barski<br />
| drcode<br />
| <br />
| Yes<br />
| [http://lisperati.com/haskell/ My Brand New Haskell Tutorial :-)]<br />
|-<br />
| Joachim Breitner<br />
| nomeata<br />
| <br />
| Yes<br />
|<br />
|}<br />
<br />
== Arriving ==<br />
<br />
===Train===<br />
<br />
* Igloo: 29 Sep at 21:00, Freiburg Hbf.<br />
* Lemmih: 29 Sep at 18:00, Freiburg Hbf.<br />
* Jutaro: 29 Sep at 23:09, Freiburg Hbf.<br />
* ivant: 30 Sep, at 8:00, from Vienna<br />
* tibbe: 5 Oct, at 8:00, from Zurich<br />
* vincenz: 4 Oct, At 23-24, Freiburg Hbf.<br />
* roconnor: 4 Oct, at 21:00, Freiburg Hbf.<br />
<br />
===Air===<br />
<br />
* Andy Gill, 29 Sep Frankfurt<br />
* Don Stewart, 29 Sep 8.35 am, Frankfurt<br />
* Thomas Schilling, 29 Sep Frankfurt Main<br />
* Conal Elliott, 25 Sep 11:10 am, Frankfurt<br />
* Ganesh Sittampalam, 29 Sep 2:50 pm, Zurich<br />
* Pepe Iborra, 29 Sep 8:40 pm, Frankfurt Hahn (HHN)<br />
* Lennart Kolmodin, 29 Sep, 12:05, Frankfurt<br />
* Björn Bringert, 04 Oct 18:55, Frankfurt (train to Freiburg dep 19.54, arr 22:15)<br />
<br />
== Accomodation ==<br />
<br />
A number of accommodation options are available. To organize to share,<br />
contact other attendees on irc or via email. <br />
<br />
=== Black Forest Hostel ===<br />
<br />
Some people are staying at the hostel: http://www.blackforest-hostel.de/<br />
<br />
* Igloo, Lemmih, nominolo: 29 Sep - 8 Oct<br />
* conal: same, in a 6-bed dorm room, 25 Sep - 8 Oct<br />
* ivant: same, 30 Sep - 8 Oct<br />
* tibbe: 6-bed dorm room, 5 Oct - 7 Oct<br />
* mnislaih: same<br />
* dcoutts, kolmodin: 6-bed dorm room, 29 Sep - 8 Oct<br />
* drcode<br />
* roconnor: dorm room, 4 Oct - 8 Oct (still to be confirmed)<br />
<br />
We will be meeting at 9am at the entrance of the Black Forest Hostel to go to the Hackathon venue.<br />
<br />
=== Best Western ===<br />
<br />
* dons, andy: Best Western<br />
<br />
=== InterCityHotel ===<br />
<br />
http://www.booking.com/hotel/de/intercityhotelfreiburg.html<br />
<br />
* bringert, vincenz: 04 Oct - 07 Oct<br />
<br />
=== Paradies ===<br />
<br />
* jutaro: 01 Oct - 07 Oct</div>Emkhttps://wiki.haskell.org/index.php?title=Hac_2007_II/Attendees&diff=15637Hac 2007 II/Attendees2007-09-17T18:51:50Z<p>Emk: </p>
<hr />
<div>[[Image:Hac-axe-icon.png|Hac icon]]<br />
<br />
== Registrants ==<br />
<br />
If you've registered, do add your name to the following table:<br />
<br />
{| class="wikitable"<br />
! Name<br />
! Nick<br />
! Affiliiation<br />
! Provided tshirt size<br />
|-<br />
| [http://www.cse.unsw.edu.au/~dons Don Stewart]<br />
| dons<br />
| Galois<br />
| Yes<br />
|-<br />
| Ian Lynagh<br />
| Igloo<br />
|<br />
| Yes<br />
|-<br />
| Duncan Coutts<br />
| dcoutts<br />
| Oxford<br />
| Yes<br />
|-<br />
| Lennart Kolmodin<br />
| kolmodin<br />
| Chalmers<br />
| Yes<br />
|-<br />
| Pepe Iborra<br />
| mnislaih<br />
| UPV<br />
| Yes<br />
|-<br />
| Ben Lippmeier<br />
| benl23<br />
| ANU<br />
|<br />
|-<br />
| David Himmelstrup<br />
| Lemmih<br />
|<br />
| Yes<br />
|- <br />
| Björn Bringert<br />
| bringert<br />
| Chalmers <br />
| Yes<br />
|-<br />
| Tim Chevalier<br />
| Binkley<br />
| PSU<br />
| Yes<br />
|-<br />
| Andy Gill<br />
| andyjgill<br />
| Galois<br />
| Yes<br />
|-<br />
| Clemens Fruhwirth<br />
| therp<br />
| <br />
| Yes<br />
|-<br />
| Thorkil Naur<br />
| naur<br />
|<br />
| Yes<br />
|-<br />
| Benedikt Schmidt<br />
| beschmi<br />
|<br />
| Yes<br />
|-<br />
| Thomas Schilling<br />
| nominolo<br />
|<br />
| Yes<br />
|-<br />
| Conal Elliott<br />
| conal<br />
|<br />
| Yes<br />
|-<br />
| Russell O'Connor<br />
| roconnor<br />
|<br />
| Yes<br />
|-<br />
| Ganesh Sittampalam<br />
| Heffalump<br />
| Credit Suisse<br />
| Yes<br />
|-<br />
| Jürgen Nicklisch<br />
| Jutaro<br />
|<br />
| <br />
|-<br />
| Ivan Tarasov<br />
| ivant<br />
|<br />
| Yes<br />
|-<br />
| Johan Tibell<br />
| tibbe<br />
|<br />
| Yes<br />
|-<br />
| Clifford Beshers<br />
| thetallguy<br />
|<br />
| Yes<br />
|-<br />
| David Fox<br />
| dsf<br />
| <br />
| Yes<br />
|-<br />
| [http://www.esat.kuleuven.ac.be/~cpoucet Christophe Poucet]<br />
| vincenz<br />
| IMEC<br />
| Yes<br />
|-<br />
| Matthias Neubauer<br />
| heckenpenner<br />
| Freiburg<br />
| Yes<br />
|-<br />
| Stefan Wehr<br />
| <br />
| Freiburg<br />
| Yes<br />
|-<br />
| [http://www.randomhacks.net/ Eric Kidd]<br />
| ekidd<br />
| Dartmouth<br />
| Yes<br />
|}<br />
<br />
== Arriving ==<br />
<br />
===Train===<br />
<br />
* Igloo: By train, 29 Sep at 21:00, Freiburg Hbf.<br />
* Lemmih: By train, 29 Sep at 18:00, Freiburg Hbf.<br />
* ivant: By train, 30 Sep, at 8:00, from Vienna<br />
* tibbe: By train, 5 Oct, at 8:00, from Zurich<br />
<br />
===Air===<br />
<br />
* Andy Gill, 29 Sep Frankfurt<br />
* Don Stewart, 29 Sep 8.35 am, Frankfurt<br />
* Thomas Schilling, 29 Sep Frankfurt Main<br />
* Conal Elliott, 25 Sep 11:10 am, Frankfurt<br />
* Ganesh Sittampalam, 29 Sep 2:50 pm, Zurich<br />
* Pepe Iborra, 29 Sep 8:40 pm, Frankfurt Hahn (HHN)<br />
* Lennart Kolmodin, 29 Sep, Frankfurt<br />
* Christophe Poucet TBD<br />
* Björn Bringert, 04 Oct 18:55, Frankfurt (train to Freiburg dep 19.54, arr 22:15)<br />
<br />
== Accomodation ==<br />
<br />
A number of accommodation options are available. To organize to share,<br />
contact other attendees on irc or via email. <br />
<br />
=== Black Forest Hostel ===<br />
<br />
Some people are staying at the hostel: http://www.blackforest-hostel.de/<br />
<br />
* Igloo, Lemmih, nominolo: 29 Sep - 8 Oct<br />
* nominolo<br />
* conal: same, in a 6-bed dorm room, 25 Sep - 8 Oct<br />
* ivant: hopefully, same, 30 Sep 8 Oct<br />
* tibbe: 6-bed dorm room, 5 Oct - 7 Oct<br />
* mnislaih: same<br />
* dcoutts, kolmodin: 6-bed dorm room, 29 Sep - 8 Oct<br />
<br />
=== Best Western ===<br />
<br />
* dons, andy: Best Western</div>Emkhttps://wiki.haskell.org/index.php?title=Hac_2007_II/Attendees&diff=15636Hac 2007 II/Attendees2007-09-17T18:51:25Z<p>Emk: </p>
<hr />
<div>[[Image:Hac-axe-icon.png|Hac icon]]<br />
<br />
== Registrants ==<br />
<br />
If you've registered, do add your name to the following table:<br />
<br />
{| class="wikitable"<br />
! Name<br />
! Nick<br />
! Affiliiation<br />
! Provided tshirt size<br />
|-<br />
| [http://www.cse.unsw.edu.au/~dons Don Stewart]<br />
| dons<br />
| Galois<br />
| Yes<br />
|-<br />
| Ian Lynagh<br />
| Igloo<br />
|<br />
| Yes<br />
|-<br />
| Duncan Coutts<br />
| dcoutts<br />
| Oxford<br />
| Yes<br />
|-<br />
| Lennart Kolmodin<br />
| kolmodin<br />
| Chalmers<br />
| Yes<br />
|-<br />
| Pepe Iborra<br />
| mnislaih<br />
| UPV<br />
| Yes<br />
|-<br />
| Ben Lippmeier<br />
| benl23<br />
| ANU<br />
|<br />
|-<br />
| David Himmelstrup<br />
| Lemmih<br />
|<br />
| Yes<br />
|- <br />
| Björn Bringert<br />
| bringert<br />
| Chalmers <br />
| Yes<br />
|-<br />
| Tim Chevalier<br />
| Binkley<br />
| PSU<br />
| Yes<br />
|-<br />
| Andy Gill<br />
| andyjgill<br />
| Galois<br />
| Yes<br />
|-<br />
| Clemens Fruhwirth<br />
| therp<br />
| <br />
| Yes<br />
|-<br />
| Thorkil Naur<br />
| naur<br />
|<br />
| Yes<br />
|-<br />
| Benedikt Schmidt<br />
| beschmi<br />
|<br />
| Yes<br />
|-<br />
| Thomas Schilling<br />
| nominolo<br />
|<br />
| Yes<br />
|-<br />
| Conal Elliott<br />
| conal<br />
|<br />
| Yes<br />
|-<br />
| Russell O'Connor<br />
| roconnor<br />
|<br />
| Yes<br />
|-<br />
| Ganesh Sittampalam<br />
| Heffalump<br />
| Credit Suisse<br />
| Yes<br />
|-<br />
| Jürgen Nicklisch<br />
| Jutaro<br />
|<br />
| <br />
|-<br />
| Ivan Tarasov<br />
| ivant<br />
|<br />
| Yes<br />
|-<br />
| Johan Tibell<br />
| tibbe<br />
|<br />
| Yes<br />
|-<br />
| Clifford Beshers<br />
| thetallguy<br />
|<br />
| Yes<br />
|-<br />
| David Fox<br />
| dsf<br />
| <br />
| Yes<br />
|-<br />
| [http://www.esat.kuleuven.ac.be/~cpoucet Christophe Poucet]<br />
| vincenz<br />
| IMEC<br />
| Yes<br />
|-<br />
| Matthias Neubauer<br />
| heckenpenner<br />
| Freiburg<br />
| Yes<br />
|-<br />
| Stefan Wehr<br />
| <br />
| Freiburg<br />
| Yes<br />
|-<br />
| [http://www.randomhacks.net/ Eric Kidd]<br />
| ekidd<br />
| Dartmouth College<br />
| Yes<br />
|}<br />
<br />
== Arriving ==<br />
<br />
===Train===<br />
<br />
* Igloo: By train, 29 Sep at 21:00, Freiburg Hbf.<br />
* Lemmih: By train, 29 Sep at 18:00, Freiburg Hbf.<br />
* ivant: By train, 30 Sep, at 8:00, from Vienna<br />
* tibbe: By train, 5 Oct, at 8:00, from Zurich<br />
<br />
===Air===<br />
<br />
* Andy Gill, 29 Sep Frankfurt<br />
* Don Stewart, 29 Sep 8.35 am, Frankfurt<br />
* Thomas Schilling, 29 Sep Frankfurt Main<br />
* Conal Elliott, 25 Sep 11:10 am, Frankfurt<br />
* Ganesh Sittampalam, 29 Sep 2:50 pm, Zurich<br />
* Pepe Iborra, 29 Sep 8:40 pm, Frankfurt Hahn (HHN)<br />
* Lennart Kolmodin, 29 Sep, Frankfurt<br />
* Christophe Poucet TBD<br />
* Björn Bringert, 04 Oct 18:55, Frankfurt (train to Freiburg dep 19.54, arr 22:15)<br />
<br />
== Accomodation ==<br />
<br />
A number of accommodation options are available. To organize to share,<br />
contact other attendees on irc or via email. <br />
<br />
=== Black Forest Hostel ===<br />
<br />
Some people are staying at the hostel: http://www.blackforest-hostel.de/<br />
<br />
* Igloo, Lemmih, nominolo: 29 Sep - 8 Oct<br />
* nominolo<br />
* conal: same, in a 6-bed dorm room, 25 Sep - 8 Oct<br />
* ivant: hopefully, same, 30 Sep 8 Oct<br />
* tibbe: 6-bed dorm room, 5 Oct - 7 Oct<br />
* mnislaih: same<br />
* dcoutts, kolmodin: 6-bed dorm room, 29 Sep - 8 Oct<br />
<br />
=== Best Western ===<br />
<br />
* dons, andy: Best Western</div>Emkhttps://wiki.haskell.org/index.php?title=Applications_and_libraries/Mathematics&diff=10608Applications and libraries/Mathematics2007-01-21T15:53:55Z<p>Emk: Mentioned various non-linear-algebra features of GSLHaskell.</p>
<hr />
<div>== Applications ==<br />
<br />
=== Physics ===<br />
<br />
;[http://ab-initio.mit.edu/meep/ Meep]<br />
:Meep (or MEEP) is a free finite-difference time-domain (FDTD) simulation software package developed at MIT to model electromagnetic systems.<br />
<br />
== Libraries ==<br />
<br />
=== Linear algebra ===<br />
<br />
;[http://dis.um.es/~alberto/GSLHaskell GSLHaskell]<br />
:High level functional interface to standard linear algebra computations and other numerical algorithms based on the GNU Scientific Library. Includes numerical differentiation, integration, Fourier transforms, polynomial root-finding, and support for gnuplot. [http://alberrto.googlepages.com/gslhaskell Alternative download site], [[GSLHaskell on MacOS X|MacOS X]].<br />
<br />
;[http://www.cs.utah.edu/~hal/HBlas/index.html Wrapper to CLAPACK]<br />
<br />
;[http://haskelldsp.sourceforge.net/ Digital Signal Processing]<br />
:Modules for matrix manipulation, digital signal processing, spectral estimation, and frequency estimation.<br />
<br />
;[http://article.gmane.org/gmane.comp.lang.haskell.general/13561 Index-aware linear algebra]<br />
:Frederik Eaton's library for statically checked matrix manipulation in Haskell<br />
<br />
;[http://cvs.haskell.org/darcs/numeric-quest/Orthogonals.html Indexless linear algebra]<br />
:algorithms by Jan Skibinski, see below<br />
<br />
See also: [[Linear algebra|Design discussions]]<br />
<br />
=== [[Physical units]] ===<br />
<br />
;[[Dimensionalized numbers]]<br />
: Working with physical units like second, meter and so on in a type-safe manner.<br />
<br />
;[http://darcs.haskell.org/numericprelude/src/Number/SI.hs NumericPrelude: Physical units]<br />
: Numeric values with dynamically checked units.<br />
<br />
;[[CalDims]]<br />
:This is not simply a library providing a new type of <hask>Num</hask> class, but stand-alone calculation tool that supports user defined functions and units (basic and derrived), so it can provide dimension-save calculation (not embedded but via shell). Calculations can be modified/saved via shell. It uses rational numbers to avoid rounding errors where possible.<br />
<br />
=== Number representations ===<br />
<br />
;[http://www.n-heptane.com/nhlab/repos/Decimal Decimal arithmetic library]<br />
:An implementation of real decimal arithmetic, for cases where the binary floating point is not acceptable (for example, money).<br />
<br />
There are several levels of [[Exact real arithmetic|handling real numbers]] and according libraries.<br />
<br />
==== Arbitrary precision ====<br />
<br />
* Numbers have fixed precision<br />
* Rounding errors accumulate<br />
* Sharing is easy, i.e. in <hask>sqrt pi + sin pi</hask>, <hask>pi</hask> is computed only once<br />
* Fast, because the routines can make use of the fast implementation of <hask>Integer</hask> operations<br />
<br />
;[http://cvs.haskell.org/darcs/numeric-quest/Fraction.hs Fractions.hs]<br />
:algorithms by Jan Skibinski, see below<br />
<br />
;[http://cvs.haskell.org/darcs/numericprelude/src/Number/FixedPoint.hs FixedPoint.hs]<br />
:part of NumericPrelude project<br />
<br />
==== Dynamic precision ====<br />
<br />
* You tell the precision, an expression shall be computed to and the computer finds out, how precise to compute the input values.<br />
* Rounding errors do not accumulate<br />
* Sharing of temporary results is difficult, that is in <hask>sqrt pi + sin pi</hask>, <hask>pi</hask> will certainly be computed twice, each time with the required precision.<br />
* Almost as fast as arbitrary precision computation<br />
<br />
;[http://www.cs.man.ac.uk/arch/dlester/exact.html ERA] is an implementation (in Haskell 1.2) by David Lester.<br />
:It is quite fast, possibly the fastest Haskell implementation. At 220 lines it is also the shortest. Probably the shortest implementation of exact real arithmetic in any language.<br />
:Here is a mirror: http://darcs.augustsson.net/Darcs/CReal/<br />
<br />
;[http://www.doc.ic.ac.uk/~ae/exact-computation/#bm:implementations IC-Reals] is an implementation by Abbas Edalat, Marko Krznar&#263; and Peter J. Potts.<br />
:This implementation uses linear fractional transformations.<br />
<br />
;[http://r6.ca/ Few Digits] by Russell O'Connor.<br />
:This is a prototype of the implementation he intendeds to write in [http://coq.inria.fr/ Coq]. Once the Coq implementation is complete, the Haskell code could be extracted producing an implementation that would be proved correct.<br />
<!--<br />
Example:<br />
*Data.Real.CReal> answer 1000 (exp 1 + sqrt 2)<br />
--><br />
<br />
;COMP is an implementation by Yann Kieffer.<br />
:The work is in beta and relies on new primitive operations on Integers which will be implemented in GHC. The library isn't available yet.<br />
<br />
==== Dynamic precision by lazy evaluation ====<br />
<br />
The real numbers are represented by an infinite datastructure, which allows you to increase precision successively by evaluating the data structure successively. All of the implementations below use some kind of digit stream as number representation.<br />
Sharing of results is simple.<br />
The implementations are either fast on simple expressions, because they use large blocks/bases, or they are fast on complex expressions, because they consume as little as possible input digits in order to emit the required output digits.<br />
<br />
;[http://medialab.freaknet.org/bignum/ BigFloat] is an implementation by Martin Guy.<br />
:It works with streams of decimal digits (strictly in the range from 0 to 9) and a separate sign. The produced digits are always correct. Output is postponed until the code is certain what the next digit is. This sometimes means that [http://medialab.freaknet.org/bignum/dudeney.html no more data is output].<br />
<br />
;In [http://users.info.unicaen.fr/~karczma/arpap/lazypi.ps.gz "The Most Unreliable Technique in the World to compute pi"] Jerzy Karczmarczuk develops some functions for computing pi lazily.<br />
<br />
;[http://darcs.haskell.org/numericprelude/src/Number/Positional.hs NumericPrelude: positional numbers]<br />
:Represents a real number as pair <hask>(exponent,[digit])</hask>, where the digits are <hask>Int</hask>s in the open range <hask>(-basis,basis)</hask>. There is no need for an extra sign item in the number data structure. The <hask>basis</hask> can range from <hask>10</hask> to <hask>1000</hask>. (Binary representations can be derived from the hexadecimal representation.) Showing the numbers in traditional format (non-negative digits) fails for fractions ending with a run of zeros. However the internal representation with negative digits can always be shown and is probably more useful for further processing. An interface for the numeric type hierarchy of the NumericPrelude project is provided.<br />
:It features<br />
:* basis conversion<br />
:* basic arithmetic: addition, subtraction, multiplication, division<br />
:* algebraic arithmetic: square root, other roots (no general polynomial roots)<br />
:* transcendental arithmetic: pi, exponential, logarithm, trigonometric and inverse trigonometric functions<br />
<br />
=== Type class hierarchies ===<br />
<br />
There are several approaches to improve the [[Mathematical prelude discussion|numeric type class hierarchy]].<br />
<br />
;Dylan Thurston and Henning Thielemann's [http://cvs.haskell.org/darcs/numericprelude/ Numeric Prelude]<br />
:Experimental revised framework for numeric type classes. Needs hiding of Prelude, overriding hidden functions like fromInteger and multi-parameter type classes. Probably restricted to GHC.<br />
<br />
;Jerzy Karczmarczuk's [http://www.haskell.org/pipermail/haskell-cafe/2001-February/001510.html approach]<br />
<br />
;Serge D. Mechveliani's [ftp://ftp.botik.ru/pub/local/Mechveliani/basAlgPropos/ Basic Algebra proposal]<br />
<br />
;Andrew Frank's [http://www.haskell.org/pipermail/haskell-cafe/2006-April/015326.html approach]<br />
:The proposal: ftp://ftp.geoinfo.tuwien.ac.at/frank/numbersPrelude_v1.pdf<br />
<br />
;Haskell Prime: [http://hackage.haskell.org/trac/haskell-prime/ticket/112 Ongoing efforts for the language revision]<br />
<br />
=== Discrete mathematics ===<br />
<br />
;[http://andrew.bromage.org/darcs/numbertheory/ Number Theory Library]<br />
:Andrew Bromage's Haskell number theory library, providing operations on primes, fibonacci sequences and combinatorics.<br />
<br />
;[http://users.skynet.be/jyp/HGAL/ HGAL]<br />
:An haskell implementation of Brendan McKay's algorithm for graph canonic labeling and automorphism group. (aka Nauty)<br />
<br />
;[http://www.cambridge.org/uk/catalogue/catalogue.asp?isbn=0521849306 Computational Oriented Matroids]<br />
:is a book by [http://wwwopt.mathematik.tu-darmstadt.de/~bokowski/ Jürgen G. Bokowski], where he develops Haskell code for Matroid computations.<br />
<br />
See also [[Libraries and tools/Cryptography]]<br />
<br />
=== Computer Algebra ===<br />
<br />
;[http://haskell.org/docon/ DoCon] - Algebraic Domain Constructor<br />
:A library for Algebra, turns GHCi into a kind of Computer Algebra System<br />
<br />
;[http://www.info.unicaen.fr/~karczma/arpap/ Papers by Jerzy Karczmarczuk]<br />
:Some interesting uses of Haskell in mathematics, including functional differentiation, power series, continued fractions.<br />
<br />
=== Miscellaneous libraries ===<br />
<br />
;[http://www.robtougher.com/HaskellMath/ HaskellMath]<br />
:The HaskellMath library is a sandbox for experimenting with mathematics algorithms. So far I've implemented a few quantitative finance models (Black Scholes, Binomial Trees, etc) and basic linear algebra functions. Next I might work on either computer algebra or linear programming. All comments welcome!<br />
<br />
;[http://www.polyomino.f2s.com/david/haskell/codeindex.html Haskell for Maths]<br />
:David Amos' [http://www.polyomino.f2s.com/david/haskell/main.html collection of math libraries] in Haskell - including number theory, commutative algebra, combinatorics, permutation groups and more.<br />
<br />
;[http://darcs.haskell.org/htam/ Various math stuff by Henning Thielemann]<br />
:This is some unsorted mathematical stuff including: GNUPlot wrapper, portable grey map (PGM) image reader and writer, simplest numerical integration, differentiation, zero finding, interpolation, solution of differential equations, combinatorics, some solutions of math riddles, computation of fractal dimensions of iterated function systems (IFS)<br />
<br />
;[http://cvs.haskell.org/darcs/numeric-quest/ Mirror of the following numeric modules by Jan Skibinski]<br />
:<br />
*[http://web.archive.org/web/*/http://www.numeric-quest.com/haskell/fractions.html Numerics with fractions]<em>(via Internet Archive since 10/06/2003).</em><br />
*[http://web.archive.org/web/*/http://www.numeric-quest.com/haskell/Roots.html Roots of polynomials]<em>(via Internet Archive since 10/06/2003).</em> It implements the well known Laguerre's method for finding complex roots of polynomials.<br />
*[http://web.archive.org/web/*/http://www.numeric-quest.com/haskell/Orthogonals.html Indexless linear algebra algorithms]<em>(via Internet Archive since 10/06/2003).</em> Orthogonalization, solution of linear equations, eigenvalues and eigenvectors.<br />
* [http://web.archive.org/web/*/http://www.numeric-quest.com/haskell/ State vector evolution]<em>(via Internet Archive since 10/06/2003)</em><br />
* [http://web.archive.org/web/*/http://www.numeric-quest.com/haskell/ Short study of fuzzy oscillator]<em>(via Internet Archive since 10/06/2003)</em><br />
* [http://web.archive.org/web/*/http://www.numeric-quest.com/haskell/Tensor.html N-dimensional tensors]<em>(via Internet Archive since 10/06/2003)</em><br />
<br />
;[http://www.dinkla.net/fp/cglib.html Geometric Algorithms]<br />
:A small Haskell library, containing algorithms for two-dimensional convex hulls, triangulations of polygons, Voronoi-diagrams and Delaunay-triangulations, the QEDS data structure, kd-trees and range-trees.<br />
<br />
;[http://repetae.net/john/recent/out/HsASA.html Adaptive Simulated Annealing]<br />
:A Haskell interface to Lester Ingber's adaptive simulating annealing code.<br />
<br />
;[http://www.solcon.nl/mklooster/repos/hmm/ Hmm: Haskell Metamath]<br />
:Hmm is a small Haskell library to parse and verify Metamath databases.<br />
<br />
;[http://eecs.oregonstate.edu/~erwig/pfp/ Probabilistic Functional Programming]<br />
:The PFP library is a collection of modules for Haskell that facilitates probabilistic functional programming, that is, programming with stochastic values. The probabilistic functional programming approach is based on a data type for representing distributions. A distribution represent the outcome of a probabilistic event as a collection of all possible values, tagged with their likelihood. A nice aspect of this system is that simulations can be specified independently from their method of execution. That is, we can either fully simulate or randomize any simulation without altering the code which defines it.<br />
<br />
;[[Sinc function]]<br />
<br />
;[http://repetae.net/john/recent/out/Boolean.html Boolean]<br />
:A general boolean algebra class and some instances for Haskell.<br />
<br />
;[http://darcs.haskell.org/~lemmih/hode/ HODE]<br />
:HODE is a binding to the Open Dynamics Engine. ODE is an open source, high performance library for simulating rigid body dynamics.<br />
<br />
;[http://sourceforge.net/projects/ranged-sets Ranged Sets]<br />
:A ranged set is a list of non-overlapping ranges. The ranges have upper and lower boundaries, and a boundary divides the base type into values above and below. No value can ever sit on a boundary. So you can have the set <math>(2.0, 3.0] \cup (5.3, 6)</math>.<br />
<br />
[[Category:Mathematics]]<br />
{{LibrariesPage}}</div>Emkhttps://wiki.haskell.org/index.php?title=Hmatrix_on_Mac_OS_X&diff=10607Hmatrix on Mac OS X2007-01-21T15:46:01Z<p>Emk: Line break fix</p>
<hr />
<div>Here are some notes on getting [http://dis.um.es/~alberto/GSLHaskell/ GSLHaskell] running under MacOS X 10.4 using [http://www.macports.org/ MacPorts]. These notes may be incomplete, and the details may change slightly in the future.<br />
<br />
Please update this page with anything you discover along the way.<br />
<br />
== Installing GHC using MacPorts ==<br />
<br />
First, you will want to install GHC using MacPorts, not the standalone installers. Assuming that you have uninstalled any other versions of ghc, type:<br />
<br />
sudo port install ghc<br />
<br />
This may take several hours to bootstrap on a slow machine.<br />
<br />
== Required libraries ==<br />
<br />
GSLHaskell requires working versions of GSL, BLAS and LAPACK. You can get GSL and BLAS from DarwinPorts:<br />
<br />
sudo port install gsl<br />
<br />
The accelerated version of LAPACK bundled with MacOS X 10.4 appears to link with GSLHaskell, though I haven't tested it extensively.<br />
<br />
== Installing GSLHaskell ==<br />
<br />
As of 20 Jan 2007, the Darcs version of GSLHaskell was easier to get working than the older tarball release. Download it as follows:<br />
<br />
darcs get http://dis.um.es/~alberto/GSLHaskell --partial<br />
<br />
Next, edit GSLHaskell/src/GSLHaskell.cabal to refer to the appropriate versions of BLAS and LAPACK:<br />
<br />
extra-libraries: gsl gslcblas LAPACK<br />
<br />
To build and install GSLHaskell, type:<br />
<br />
cd GSLHaskell/src<br />
runhaskell Setup.hs configure<br />
runhaskell Setup.hs build<br />
sudo runhaskell Setup.hs install<br />
<br />
== Using GSLHaskell ==<br />
<br />
These instructions are awkward, and can probably be improved with better knowledge of GHC and/or Cabal.<br />
<br />
To load GSLHaskell using GHCI, you need to add two directories to your LD_LIBRARY_PATH:<br />
<br />
export LD_LIBRARY_PATH=/System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/:/opt/local/lib<br />
<br />
To build an example program using GHC, type:<br />
<br />
cd ../examples<br />
ghc --make -optl-L/System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/ plot.hs<br />
<br />
== Plotting with gnuplot and Aquaterm ==<br />
<br />
Install gnuplot using MacPorts:<br />
<br />
sudo port install gnuplot<br />
<br />
If Aquaterm fails to compile, upgrade to the latest version of XCode. Tell gnuplot what terminal to use:<br />
<br />
export GNUTERM=aqua<br />
<br />
You should now be able to build and run GSLHaskell/examples/plot.hs, and see three nicely anti-aliased plots. If you're using an xterm, you can also choose to leave GNUTERM unset to use gnuplot's built-in X11 support, which is uglier, but apparently allows rotation of 3D plots using the mouse.</div>Emkhttps://wiki.haskell.org/index.php?title=Hmatrix_on_Mac_OS_X&diff=10606Hmatrix on Mac OS X2007-01-21T15:45:09Z<p>Emk: Word fix</p>
<hr />
<div>Here are some notes on getting [http://dis.um.es/~alberto/GSLHaskell/ GSLHaskell] running under MacOS X 10.4 using [http://www.macports.org/ MacPorts]. These notes may be incomplete, and the details may change slightly in the future.<br />
<br />
Please update this page with anything you discover along the way.<br />
<br />
== Installing GHC using MacPorts ==<br />
<br />
First, you will want to install GHC using MacPorts, not the standalone installers. Assuming that you have uninstalled any other versions of ghc, type:<br />
<br />
sudo port install ghc<br />
<br />
This may take several hours to bootstrap on a slow machine.<br />
<br />
== Required libraries ==<br />
<br />
GSLHaskell requires working versions of GSL, BLAS and LAPACK. You can get GSL and BLAS from DarwinPorts:<br />
<br />
sudo port install gsl<br />
<br />
The accelerated version of LAPACK bundled with MacOS X 10.4 appears to link with GSLHaskell, though I haven't tested it extensively.<br />
<br />
== Installing GSLHaskell ==<br />
<br />
As of 20 Jan 2007, the Darcs version of GSLHaskell was easier to get working than the older tarball release. Download it as follows:<br />
<br />
darcs get http://dis.um.es/~alberto/GSLHaskell --partial<br />
<br />
Next, edit GSLHaskell/src/GSLHaskell.cabal to refer to the appropriate versions of BLAS and LAPACK:<br />
<br />
extra-libraries: gsl gslcblas LAPACK<br />
<br />
To build and install GSLHaskell, type:<br />
<br />
cd GSLHaskell/src<br />
runhaskell Setup.hs configure<br />
runhaskell Setup.hs build<br />
sudo runhaskell Setup.hs install<br />
<br />
== Using GSLHaskell ==<br />
<br />
These instructions are awkward, and can probably be improved with better knowledge of GHC and/or Cabal.<br />
<br />
To load GSLHaskell using GHCI, you need to add two directories to your LD_LIBRARY_PATH:<br />
<br />
export LD_LIBRARY_PATH=/System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/:/opt/local/lib<br />
<br />
To build an example program using GHC, type:<br />
<br />
cd ../examples<br />
ghc --make -optl-L/System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/<br />
plot.hs<br />
<br />
== Plotting with gnuplot and Aquaterm ==<br />
<br />
Install gnuplot using MacPorts:<br />
<br />
sudo port install gnuplot<br />
<br />
If Aquaterm fails to compile, upgrade to the latest version of XCode. Tell gnuplot what terminal to use:<br />
<br />
export GNUTERM=aqua<br />
<br />
You should now be able to build and run GSLHaskell/examples/plot.hs, and see three nicely anti-aliased plots. If you're using an xterm, you can also choose to leave GNUTERM unset to use gnuplot's built-in X11 support, which is uglier, but apparently allows rotation of 3D plots using the mouse.</div>Emkhttps://wiki.haskell.org/index.php?title=Hmatrix_on_Mac_OS_X&diff=10605Hmatrix on Mac OS X2007-01-21T15:42:17Z<p>Emk: Fixed formatting of source code</p>
<hr />
<div>Here are some notes on getting [http://dis.um.es/~alberto/GSLHaskell/ GSLHaskell] running under MacOS X 10.4 using [http://www.macports.org/ MacPorts]. These notes may be incomplete, and the details may change slightly in the future.<br />
<br />
Please update this page with anything you discover along the way.<br />
<br />
== Installing GHC using MacPorts ==<br />
<br />
First, you will want to install GHC using MacPorts, not the standalone installers. Assuming that you have uninstalled any other versions of Haskell, type:<br />
<br />
sudo port install ghc<br />
<br />
This may take several hours to bootstrap on a slow machine.<br />
<br />
== Required libraries ==<br />
<br />
GSLHaskell requires working versions of GSL, BLAS and LAPACK. You can get GSL and BLAS from DarwinPorts:<br />
<br />
sudo port install gsl<br />
<br />
The accelerated version of LAPACK bundled with MacOS X 10.4 appears to link with GSLHaskell, though I haven't tested it extensively.<br />
<br />
== Installing GSLHaskell ==<br />
<br />
As of 20 Jan 2007, the Darcs version of GSLHaskell was easier to get working than the older tarball release. Download it as follows:<br />
<br />
darcs get http://dis.um.es/~alberto/GSLHaskell --partial<br />
<br />
Next, edit GSLHaskell/src/GSLHaskell.cabal to refer to the appropriate versions of BLAS and LAPACK:<br />
<br />
extra-libraries: gsl gslcblas LAPACK<br />
<br />
To build and install GSLHaskell, type:<br />
<br />
cd GSLHaskell/src<br />
runhaskell Setup.hs configure<br />
runhaskell Setup.hs build<br />
sudo runhaskell Setup.hs install<br />
<br />
== Using GSLHaskell ==<br />
<br />
These instructions are awkward, and can probably be improved with better knowledge of GHC and/or Cabal.<br />
<br />
To load GSLHaskell using GHCI, you need to add two directories to your LD_LIBRARY_PATH:<br />
<br />
export LD_LIBRARY_PATH=/System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/:/opt/local/lib<br />
<br />
To build an example program using GHC, type:<br />
<br />
cd ../examples<br />
ghc --make -optl-L/System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/<br />
plot.hs<br />
<br />
== Plotting with gnuplot and Aquaterm ==<br />
<br />
Install gnuplot using MacPorts:<br />
<br />
sudo port install gnuplot<br />
<br />
If Aquaterm fails to compile, upgrade to the latest version of XCode. Tell gnuplot what terminal to use:<br />
<br />
export GNUTERM=aqua<br />
<br />
You should now be able to build and run GSLHaskell/examples/plot.hs, and see three nicely anti-aliased plots. If you're using an xterm, you can also choose to leave GNUTERM unset to use gnuplot's built-in X11 support, which is uglier, but apparently allows rotation of 3D plots using the mouse.</div>Emkhttps://wiki.haskell.org/index.php?title=Hmatrix_on_Mac_OS_X&diff=10604Hmatrix on Mac OS X2007-01-21T15:40:02Z<p>Emk: Basic instructions for GSLHaskell on MacOS X</p>
<hr />
<div>Here are some notes on getting [http://dis.um.es/~alberto/GSLHaskell/ GSLHaskell] running under MacOS X 10.4 using [http://www.macports.org/ MacPorts]. These notes may be incomplete, and the details may change slightly in the future.<br />
<br />
Please update this page with anything you discover along the way.<br />
<br />
== Installing GHC using MacPorts ==<br />
<br />
First, you will want to install GHC using MacPorts, not the standalone installers. Assuming that you have uninstalled any other versions of Haskell, type:<br />
<br />
{{{<br />
sudo port install ghc<br />
}}}<br />
<br />
This may take several hours to bootstrap on a slow machine.<br />
<br />
== Required libraries ==<br />
<br />
GSLHaskell requires working versions of GSL, BLAS and LAPACK. You can get GSL and BLAS from DarwinPorts:<br />
<br />
{{{<br />
sudo port install gsl<br />
}}}<br />
<br />
The accelerated version of LAPACK bundled with MacOS X 10.4 appears to link with GSLHaskell, though I haven't tested it extensively.<br />
<br />
== Installing GSLHaskell ==<br />
<br />
As of 20 Jan 2007, the Darcs version of GSLHaskell was easier to get working than the older tarball release. Download it as follows:<br />
<br />
{{{<br />
darcs get http://dis.um.es/~alberto/GSLHaskell --partial<br />
}}}<br />
<br />
Next, edit GSLHaskell/src/GSLHaskell.cabal to refer to the appropriate versions of BLAS and LAPACK:<br />
<br />
{{{<br />
extra-libraries: gsl gslcblas LAPACK<br />
}}}<br />
<br />
To build and install GSLHaskell, type:<br />
<br />
{{{<br />
cd GSLHaskell/src<br />
runhaskell Setup.hs configure<br />
runhaskell Setup.hs build<br />
sudo runhaskell Setup.hs install<br />
}}}<br />
<br />
== Using GSLHaskell ==<br />
<br />
These instructions are awkward, and can probably be improved with better knowledge of GHC and/or Cabal.<br />
<br />
To load GSLHaskell using GHCI, you need to add two directories to your LD_LIBRARY_PATH:<br />
<br />
{{{<br />
export LD_LIBRARY_PATH=/System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/:/opt/local/lib<br />
}}}<br />
<br />
To build an example program using GHC, type:<br />
<br />
{{{<br />
cd ../examples<br />
ghc --make -optl-L/System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/<br />
plot.hs<br />
}}}<br />
<br />
== Plotting with gnuplot and Aquaterm ==<br />
<br />
Install gnuplot using MacPorts:<br />
<br />
{{{<br />
sudo port install gnuplot<br />
}}}<br />
<br />
If Aquaterm fails to compile, upgrade to the latest version of XCode. Tell gnuplot what terminal to use:<br />
<br />
{{{<br />
export GNUTERM=aqua<br />
}}}<br />
<br />
You should now be able to build and run GSLHaskell/examples/plot.hs, and see three nicely anti-aliased plots. If you're using an xterm, you can also choose to leave GNUTERM unset to use gnuplot's built-in X11 support, which is uglier, but apparently allows rotation of 3D plots using the mouse.</div>Emkhttps://wiki.haskell.org/index.php?title=Hmatrix_on_Mac_OS_X&diff=10603Hmatrix on Mac OS X2007-01-21T15:20:03Z<p>Emk: </p>
<hr />
<div>Here are some notes on getting [http://dis.um.es/~alberto/GSLHaskell/ GSLHaskell] running under MacOS X 10.4 using [http://www.macports.org/ MacPorts]. These notes may be incomplete, and the details may change slightly in the future.<br />
<br />
Please update this page with anything you discover along the way.<br />
<br />
== Installing GHC using MacPorts ==<br />
<br />
First, you will want to install GHC using MacPorts, not the standalone installers. Assuming that you have uninstalled any other versions of Haskell, type:<br />
<br />
{{{<br />
sudo port install ghc<br />
}}}<br />
<br />
This may take several hours to bootstrap on a slow machine.<br />
<br />
== Required Libraries ==<br />
<br />
GSLHaskell requires working versions of GSL, BLAS and LAPACK. You can get</div>Emkhttps://wiki.haskell.org/index.php?title=Applications_and_libraries/Mathematics&diff=10602Applications and libraries/Mathematics2007-01-21T15:11:02Z<p>Emk: Changed title of linked-to page for GSLHaskell</p>
<hr />
<div>== Applications ==<br />
<br />
=== Physics ===<br />
<br />
;[http://ab-initio.mit.edu/meep/ Meep]<br />
:Meep (or MEEP) is a free finite-difference time-domain (FDTD) simulation software package developed at MIT to model electromagnetic systems.<br />
<br />
== Libraries ==<br />
<br />
=== Linear algebra ===<br />
<br />
;[http://dis.um.es/~alberto/GSLHaskell GSLHaskell]<br />
:High level functional interface to standard linear algebra computations and other numerical algorithms based on the GNU Scientific Library. [http://alberrto.googlepages.com/gslhaskell Alternative download site], [[GSLHaskell on MacOS X|MacOS X]].<br />
<br />
;[http://www.cs.utah.edu/~hal/HBlas/index.html Wrapper to CLAPACK]<br />
<br />
;[http://haskelldsp.sourceforge.net/ Digital Signal Processing]<br />
:Modules for matrix manipulation, digital signal processing, spectral estimation, and frequency estimation.<br />
<br />
;[http://article.gmane.org/gmane.comp.lang.haskell.general/13561 Index-aware linear algebra]<br />
:Frederik Eaton's library for statically checked matrix manipulation in Haskell<br />
<br />
;[http://cvs.haskell.org/darcs/numeric-quest/Orthogonals.html Indexless linear algebra]<br />
:algorithms by Jan Skibinski, see below<br />
<br />
See also: [[Linear algebra|Design discussions]]<br />
<br />
=== [[Physical units]] ===<br />
<br />
;[[Dimensionalized numbers]]<br />
: Working with physical units like second, meter and so on in a type-safe manner.<br />
<br />
;[http://darcs.haskell.org/numericprelude/src/Number/SI.hs NumericPrelude: Physical units]<br />
: Numeric values with dynamically checked units.<br />
<br />
;[[CalDims]]<br />
:This is not simply a library providing a new type of <hask>Num</hask> class, but stand-alone calculation tool that supports user defined functions and units (basic and derrived), so it can provide dimension-save calculation (not embedded but via shell). Calculations can be modified/saved via shell. It uses rational numbers to avoid rounding errors where possible.<br />
<br />
=== Number representations ===<br />
<br />
;[http://www.n-heptane.com/nhlab/repos/Decimal Decimal arithmetic library]<br />
:An implementation of real decimal arithmetic, for cases where the binary floating point is not acceptable (for example, money).<br />
<br />
There are several levels of [[Exact real arithmetic|handling real numbers]] and according libraries.<br />
<br />
==== Arbitrary precision ====<br />
<br />
* Numbers have fixed precision<br />
* Rounding errors accumulate<br />
* Sharing is easy, i.e. in <hask>sqrt pi + sin pi</hask>, <hask>pi</hask> is computed only once<br />
* Fast, because the routines can make use of the fast implementation of <hask>Integer</hask> operations<br />
<br />
;[http://cvs.haskell.org/darcs/numeric-quest/Fraction.hs Fractions.hs]<br />
:algorithms by Jan Skibinski, see below<br />
<br />
;[http://cvs.haskell.org/darcs/numericprelude/src/Number/FixedPoint.hs FixedPoint.hs]<br />
:part of NumericPrelude project<br />
<br />
==== Dynamic precision ====<br />
<br />
* You tell the precision, an expression shall be computed to and the computer finds out, how precise to compute the input values.<br />
* Rounding errors do not accumulate<br />
* Sharing of temporary results is difficult, that is in <hask>sqrt pi + sin pi</hask>, <hask>pi</hask> will certainly be computed twice, each time with the required precision.<br />
* Almost as fast as arbitrary precision computation<br />
<br />
;[http://www.cs.man.ac.uk/arch/dlester/exact.html ERA] is an implementation (in Haskell 1.2) by David Lester.<br />
:It is quite fast, possibly the fastest Haskell implementation. At 220 lines it is also the shortest. Probably the shortest implementation of exact real arithmetic in any language.<br />
:Here is a mirror: http://darcs.augustsson.net/Darcs/CReal/<br />
<br />
;[http://www.doc.ic.ac.uk/~ae/exact-computation/#bm:implementations IC-Reals] is an implementation by Abbas Edalat, Marko Krznar&#263; and Peter J. Potts.<br />
:This implementation uses linear fractional transformations.<br />
<br />
;[http://r6.ca/ Few Digits] by Russell O'Connor.<br />
:This is a prototype of the implementation he intendeds to write in [http://coq.inria.fr/ Coq]. Once the Coq implementation is complete, the Haskell code could be extracted producing an implementation that would be proved correct.<br />
<!--<br />
Example:<br />
*Data.Real.CReal> answer 1000 (exp 1 + sqrt 2)<br />
--><br />
<br />
;COMP is an implementation by Yann Kieffer.<br />
:The work is in beta and relies on new primitive operations on Integers which will be implemented in GHC. The library isn't available yet.<br />
<br />
==== Dynamic precision by lazy evaluation ====<br />
<br />
The real numbers are represented by an infinite datastructure, which allows you to increase precision successively by evaluating the data structure successively. All of the implementations below use some kind of digit stream as number representation.<br />
Sharing of results is simple.<br />
The implementations are either fast on simple expressions, because they use large blocks/bases, or they are fast on complex expressions, because they consume as little as possible input digits in order to emit the required output digits.<br />
<br />
;[http://medialab.freaknet.org/bignum/ BigFloat] is an implementation by Martin Guy.<br />
:It works with streams of decimal digits (strictly in the range from 0 to 9) and a separate sign. The produced digits are always correct. Output is postponed until the code is certain what the next digit is. This sometimes means that [http://medialab.freaknet.org/bignum/dudeney.html no more data is output].<br />
<br />
;In [http://users.info.unicaen.fr/~karczma/arpap/lazypi.ps.gz "The Most Unreliable Technique in the World to compute pi"] Jerzy Karczmarczuk develops some functions for computing pi lazily.<br />
<br />
;[http://darcs.haskell.org/numericprelude/src/Number/Positional.hs NumericPrelude: positional numbers]<br />
:Represents a real number as pair <hask>(exponent,[digit])</hask>, where the digits are <hask>Int</hask>s in the open range <hask>(-basis,basis)</hask>. There is no need for an extra sign item in the number data structure. The <hask>basis</hask> can range from <hask>10</hask> to <hask>1000</hask>. (Binary representations can be derived from the hexadecimal representation.) Showing the numbers in traditional format (non-negative digits) fails for fractions ending with a run of zeros. However the internal representation with negative digits can always be shown and is probably more useful for further processing. An interface for the numeric type hierarchy of the NumericPrelude project is provided.<br />
:It features<br />
:* basis conversion<br />
:* basic arithmetic: addition, subtraction, multiplication, division<br />
:* algebraic arithmetic: square root, other roots (no general polynomial roots)<br />
:* transcendental arithmetic: pi, exponential, logarithm, trigonometric and inverse trigonometric functions<br />
<br />
=== Type class hierarchies ===<br />
<br />
There are several approaches to improve the [[Mathematical prelude discussion|numeric type class hierarchy]].<br />
<br />
;Dylan Thurston and Henning Thielemann's [http://cvs.haskell.org/darcs/numericprelude/ Numeric Prelude]<br />
:Experimental revised framework for numeric type classes. Needs hiding of Prelude, overriding hidden functions like fromInteger and multi-parameter type classes. Probably restricted to GHC.<br />
<br />
;Jerzy Karczmarczuk's [http://www.haskell.org/pipermail/haskell-cafe/2001-February/001510.html approach]<br />
<br />
;Serge D. Mechveliani's [ftp://ftp.botik.ru/pub/local/Mechveliani/basAlgPropos/ Basic Algebra proposal]<br />
<br />
;Andrew Frank's [http://www.haskell.org/pipermail/haskell-cafe/2006-April/015326.html approach]<br />
:The proposal: ftp://ftp.geoinfo.tuwien.ac.at/frank/numbersPrelude_v1.pdf<br />
<br />
;Haskell Prime: [http://hackage.haskell.org/trac/haskell-prime/ticket/112 Ongoing efforts for the language revision]<br />
<br />
=== Discrete mathematics ===<br />
<br />
;[http://andrew.bromage.org/darcs/numbertheory/ Number Theory Library]<br />
:Andrew Bromage's Haskell number theory library, providing operations on primes, fibonacci sequences and combinatorics.<br />
<br />
;[http://users.skynet.be/jyp/HGAL/ HGAL]<br />
:An haskell implementation of Brendan McKay's algorithm for graph canonic labeling and automorphism group. (aka Nauty)<br />
<br />
;[http://www.cambridge.org/uk/catalogue/catalogue.asp?isbn=0521849306 Computational Oriented Matroids]<br />
:is a book by [http://wwwopt.mathematik.tu-darmstadt.de/~bokowski/ Jürgen G. Bokowski], where he develops Haskell code for Matroid computations.<br />
<br />
See also [[Libraries and tools/Cryptography]]<br />
<br />
=== Computer Algebra ===<br />
<br />
;[http://haskell.org/docon/ DoCon] - Algebraic Domain Constructor<br />
:A library for Algebra, turns GHCi into a kind of Computer Algebra System<br />
<br />
;[http://www.info.unicaen.fr/~karczma/arpap/ Papers by Jerzy Karczmarczuk]<br />
:Some interesting uses of Haskell in mathematics, including functional differentiation, power series, continued fractions.<br />
<br />
=== Miscellaneous libraries ===<br />
<br />
;[http://www.robtougher.com/HaskellMath/ HaskellMath]<br />
:The HaskellMath library is a sandbox for experimenting with mathematics algorithms. So far I've implemented a few quantitative finance models (Black Scholes, Binomial Trees, etc) and basic linear algebra functions. Next I might work on either computer algebra or linear programming. All comments welcome!<br />
<br />
;[http://www.polyomino.f2s.com/david/haskell/codeindex.html Haskell for Maths]<br />
:David Amos' [http://www.polyomino.f2s.com/david/haskell/main.html collection of math libraries] in Haskell - including number theory, commutative algebra, combinatorics, permutation groups and more.<br />
<br />
;[http://darcs.haskell.org/htam/ Various math stuff by Henning Thielemann]<br />
:This is some unsorted mathematical stuff including: GNUPlot wrapper, portable grey map (PGM) image reader and writer, simplest numerical integration, differentiation, zero finding, interpolation, solution of differential equations, combinatorics, some solutions of math riddles, computation of fractal dimensions of iterated function systems (IFS)<br />
<br />
;[http://cvs.haskell.org/darcs/numeric-quest/ Mirror of the following numeric modules by Jan Skibinski]<br />
:<br />
*[http://web.archive.org/web/*/http://www.numeric-quest.com/haskell/fractions.html Numerics with fractions]<em>(via Internet Archive since 10/06/2003).</em><br />
*[http://web.archive.org/web/*/http://www.numeric-quest.com/haskell/Roots.html Roots of polynomials]<em>(via Internet Archive since 10/06/2003).</em> It implements the well known Laguerre's method for finding complex roots of polynomials.<br />
*[http://web.archive.org/web/*/http://www.numeric-quest.com/haskell/Orthogonals.html Indexless linear algebra algorithms]<em>(via Internet Archive since 10/06/2003).</em> Orthogonalization, solution of linear equations, eigenvalues and eigenvectors.<br />
* [http://web.archive.org/web/*/http://www.numeric-quest.com/haskell/ State vector evolution]<em>(via Internet Archive since 10/06/2003)</em><br />
* [http://web.archive.org/web/*/http://www.numeric-quest.com/haskell/ Short study of fuzzy oscillator]<em>(via Internet Archive since 10/06/2003)</em><br />
* [http://web.archive.org/web/*/http://www.numeric-quest.com/haskell/Tensor.html N-dimensional tensors]<em>(via Internet Archive since 10/06/2003)</em><br />
<br />
;[http://www.dinkla.net/fp/cglib.html Geometric Algorithms]<br />
:A small Haskell library, containing algorithms for two-dimensional convex hulls, triangulations of polygons, Voronoi-diagrams and Delaunay-triangulations, the QEDS data structure, kd-trees and range-trees.<br />
<br />
;[http://repetae.net/john/recent/out/HsASA.html Adaptive Simulated Annealing]<br />
:A Haskell interface to Lester Ingber's adaptive simulating annealing code.<br />
<br />
;[http://www.solcon.nl/mklooster/repos/hmm/ Hmm: Haskell Metamath]<br />
:Hmm is a small Haskell library to parse and verify Metamath databases.<br />
<br />
;[http://eecs.oregonstate.edu/~erwig/pfp/ Probabilistic Functional Programming]<br />
:The PFP library is a collection of modules for Haskell that facilitates probabilistic functional programming, that is, programming with stochastic values. The probabilistic functional programming approach is based on a data type for representing distributions. A distribution represent the outcome of a probabilistic event as a collection of all possible values, tagged with their likelihood. A nice aspect of this system is that simulations can be specified independently from their method of execution. That is, we can either fully simulate or randomize any simulation without altering the code which defines it.<br />
<br />
;[[Sinc function]]<br />
<br />
;[http://repetae.net/john/recent/out/Boolean.html Boolean]<br />
:A general boolean algebra class and some instances for Haskell.<br />
<br />
;[http://darcs.haskell.org/~lemmih/hode/ HODE]<br />
:HODE is a binding to the Open Dynamics Engine. ODE is an open source, high performance library for simulating rigid body dynamics.<br />
<br />
;[http://sourceforge.net/projects/ranged-sets Ranged Sets]<br />
:A ranged set is a list of non-overlapping ranges. The ranges have upper and lower boundaries, and a boundary divides the base type into values above and below. No value can ever sit on a boundary. So you can have the set <math>(2.0, 3.0] \cup (5.3, 6)</math>.<br />
<br />
[[Category:Mathematics]]<br />
{{LibrariesPage}}</div>Emkhttps://wiki.haskell.org/index.php?title=Applications_and_libraries/Mathematics&diff=10601Applications and libraries/Mathematics2007-01-21T15:06:43Z<p>Emk: Fixed typo in last change</p>
<hr />
<div>== Applications ==<br />
<br />
=== Physics ===<br />
<br />
;[http://ab-initio.mit.edu/meep/ Meep]<br />
:Meep (or MEEP) is a free finite-difference time-domain (FDTD) simulation software package developed at MIT to model electromagnetic systems.<br />
<br />
== Libraries ==<br />
<br />
=== Linear algebra ===<br />
<br />
;[http://dis.um.es/~alberto/GSLHaskell GSLHaskell]<br />
:High level functional interface to standard linear algebra computations and other numerical algorithms based on the GNU Scientific Library. [http://alberrto.googlepages.com/gslhaskell Alternative download site], [[GSL Haskell on MacOS X|MacOS X]].<br />
<br />
;[http://www.cs.utah.edu/~hal/HBlas/index.html Wrapper to CLAPACK]<br />
<br />
;[http://haskelldsp.sourceforge.net/ Digital Signal Processing]<br />
:Modules for matrix manipulation, digital signal processing, spectral estimation, and frequency estimation.<br />
<br />
;[http://article.gmane.org/gmane.comp.lang.haskell.general/13561 Index-aware linear algebra]<br />
:Frederik Eaton's library for statically checked matrix manipulation in Haskell<br />
<br />
;[http://cvs.haskell.org/darcs/numeric-quest/Orthogonals.html Indexless linear algebra]<br />
:algorithms by Jan Skibinski, see below<br />
<br />
See also: [[Linear algebra|Design discussions]]<br />
<br />
=== [[Physical units]] ===<br />
<br />
;[[Dimensionalized numbers]]<br />
: Working with physical units like second, meter and so on in a type-safe manner.<br />
<br />
;[http://darcs.haskell.org/numericprelude/src/Number/SI.hs NumericPrelude: Physical units]<br />
: Numeric values with dynamically checked units.<br />
<br />
;[[CalDims]]<br />
:This is not simply a library providing a new type of <hask>Num</hask> class, but stand-alone calculation tool that supports user defined functions and units (basic and derrived), so it can provide dimension-save calculation (not embedded but via shell). Calculations can be modified/saved via shell. It uses rational numbers to avoid rounding errors where possible.<br />
<br />
=== Number representations ===<br />
<br />
;[http://www.n-heptane.com/nhlab/repos/Decimal Decimal arithmetic library]<br />
:An implementation of real decimal arithmetic, for cases where the binary floating point is not acceptable (for example, money).<br />
<br />
There are several levels of [[Exact real arithmetic|handling real numbers]] and according libraries.<br />
<br />
==== Arbitrary precision ====<br />
<br />
* Numbers have fixed precision<br />
* Rounding errors accumulate<br />
* Sharing is easy, i.e. in <hask>sqrt pi + sin pi</hask>, <hask>pi</hask> is computed only once<br />
* Fast, because the routines can make use of the fast implementation of <hask>Integer</hask> operations<br />
<br />
;[http://cvs.haskell.org/darcs/numeric-quest/Fraction.hs Fractions.hs]<br />
:algorithms by Jan Skibinski, see below<br />
<br />
;[http://cvs.haskell.org/darcs/numericprelude/src/Number/FixedPoint.hs FixedPoint.hs]<br />
:part of NumericPrelude project<br />
<br />
==== Dynamic precision ====<br />
<br />
* You tell the precision, an expression shall be computed to and the computer finds out, how precise to compute the input values.<br />
* Rounding errors do not accumulate<br />
* Sharing of temporary results is difficult, that is in <hask>sqrt pi + sin pi</hask>, <hask>pi</hask> will certainly be computed twice, each time with the required precision.<br />
* Almost as fast as arbitrary precision computation<br />
<br />
;[http://www.cs.man.ac.uk/arch/dlester/exact.html ERA] is an implementation (in Haskell 1.2) by David Lester.<br />
:It is quite fast, possibly the fastest Haskell implementation. At 220 lines it is also the shortest. Probably the shortest implementation of exact real arithmetic in any language.<br />
:Here is a mirror: http://darcs.augustsson.net/Darcs/CReal/<br />
<br />
;[http://www.doc.ic.ac.uk/~ae/exact-computation/#bm:implementations IC-Reals] is an implementation by Abbas Edalat, Marko Krznar&#263; and Peter J. Potts.<br />
:This implementation uses linear fractional transformations.<br />
<br />
;[http://r6.ca/ Few Digits] by Russell O'Connor.<br />
:This is a prototype of the implementation he intendeds to write in [http://coq.inria.fr/ Coq]. Once the Coq implementation is complete, the Haskell code could be extracted producing an implementation that would be proved correct.<br />
<!--<br />
Example:<br />
*Data.Real.CReal> answer 1000 (exp 1 + sqrt 2)<br />
--><br />
<br />
;COMP is an implementation by Yann Kieffer.<br />
:The work is in beta and relies on new primitive operations on Integers which will be implemented in GHC. The library isn't available yet.<br />
<br />
==== Dynamic precision by lazy evaluation ====<br />
<br />
The real numbers are represented by an infinite datastructure, which allows you to increase precision successively by evaluating the data structure successively. All of the implementations below use some kind of digit stream as number representation.<br />
Sharing of results is simple.<br />
The implementations are either fast on simple expressions, because they use large blocks/bases, or they are fast on complex expressions, because they consume as little as possible input digits in order to emit the required output digits.<br />
<br />
;[http://medialab.freaknet.org/bignum/ BigFloat] is an implementation by Martin Guy.<br />
:It works with streams of decimal digits (strictly in the range from 0 to 9) and a separate sign. The produced digits are always correct. Output is postponed until the code is certain what the next digit is. This sometimes means that [http://medialab.freaknet.org/bignum/dudeney.html no more data is output].<br />
<br />
;In [http://users.info.unicaen.fr/~karczma/arpap/lazypi.ps.gz "The Most Unreliable Technique in the World to compute pi"] Jerzy Karczmarczuk develops some functions for computing pi lazily.<br />
<br />
;[http://darcs.haskell.org/numericprelude/src/Number/Positional.hs NumericPrelude: positional numbers]<br />
:Represents a real number as pair <hask>(exponent,[digit])</hask>, where the digits are <hask>Int</hask>s in the open range <hask>(-basis,basis)</hask>. There is no need for an extra sign item in the number data structure. The <hask>basis</hask> can range from <hask>10</hask> to <hask>1000</hask>. (Binary representations can be derived from the hexadecimal representation.) Showing the numbers in traditional format (non-negative digits) fails for fractions ending with a run of zeros. However the internal representation with negative digits can always be shown and is probably more useful for further processing. An interface for the numeric type hierarchy of the NumericPrelude project is provided.<br />
:It features<br />
:* basis conversion<br />
:* basic arithmetic: addition, subtraction, multiplication, division<br />
:* algebraic arithmetic: square root, other roots (no general polynomial roots)<br />
:* transcendental arithmetic: pi, exponential, logarithm, trigonometric and inverse trigonometric functions<br />
<br />
=== Type class hierarchies ===<br />
<br />
There are several approaches to improve the [[Mathematical prelude discussion|numeric type class hierarchy]].<br />
<br />
;Dylan Thurston and Henning Thielemann's [http://cvs.haskell.org/darcs/numericprelude/ Numeric Prelude]<br />
:Experimental revised framework for numeric type classes. Needs hiding of Prelude, overriding hidden functions like fromInteger and multi-parameter type classes. Probably restricted to GHC.<br />
<br />
;Jerzy Karczmarczuk's [http://www.haskell.org/pipermail/haskell-cafe/2001-February/001510.html approach]<br />
<br />
;Serge D. Mechveliani's [ftp://ftp.botik.ru/pub/local/Mechveliani/basAlgPropos/ Basic Algebra proposal]<br />
<br />
;Andrew Frank's [http://www.haskell.org/pipermail/haskell-cafe/2006-April/015326.html approach]<br />
:The proposal: ftp://ftp.geoinfo.tuwien.ac.at/frank/numbersPrelude_v1.pdf<br />
<br />
;Haskell Prime: [http://hackage.haskell.org/trac/haskell-prime/ticket/112 Ongoing efforts for the language revision]<br />
<br />
=== Discrete mathematics ===<br />
<br />
;[http://andrew.bromage.org/darcs/numbertheory/ Number Theory Library]<br />
:Andrew Bromage's Haskell number theory library, providing operations on primes, fibonacci sequences and combinatorics.<br />
<br />
;[http://users.skynet.be/jyp/HGAL/ HGAL]<br />
:An haskell implementation of Brendan McKay's algorithm for graph canonic labeling and automorphism group. (aka Nauty)<br />
<br />
;[http://www.cambridge.org/uk/catalogue/catalogue.asp?isbn=0521849306 Computational Oriented Matroids]<br />
:is a book by [http://wwwopt.mathematik.tu-darmstadt.de/~bokowski/ Jürgen G. Bokowski], where he develops Haskell code for Matroid computations.<br />
<br />
See also [[Libraries and tools/Cryptography]]<br />
<br />
=== Computer Algebra ===<br />
<br />
;[http://haskell.org/docon/ DoCon] - Algebraic Domain Constructor<br />
:A library for Algebra, turns GHCi into a kind of Computer Algebra System<br />
<br />
;[http://www.info.unicaen.fr/~karczma/arpap/ Papers by Jerzy Karczmarczuk]<br />
:Some interesting uses of Haskell in mathematics, including functional differentiation, power series, continued fractions.<br />
<br />
=== Miscellaneous libraries ===<br />
<br />
;[http://www.robtougher.com/HaskellMath/ HaskellMath]<br />
:The HaskellMath library is a sandbox for experimenting with mathematics algorithms. So far I've implemented a few quantitative finance models (Black Scholes, Binomial Trees, etc) and basic linear algebra functions. Next I might work on either computer algebra or linear programming. All comments welcome!<br />
<br />
;[http://www.polyomino.f2s.com/david/haskell/codeindex.html Haskell for Maths]<br />
:David Amos' [http://www.polyomino.f2s.com/david/haskell/main.html collection of math libraries] in Haskell - including number theory, commutative algebra, combinatorics, permutation groups and more.<br />
<br />
;[http://darcs.haskell.org/htam/ Various math stuff by Henning Thielemann]<br />
:This is some unsorted mathematical stuff including: GNUPlot wrapper, portable grey map (PGM) image reader and writer, simplest numerical integration, differentiation, zero finding, interpolation, solution of differential equations, combinatorics, some solutions of math riddles, computation of fractal dimensions of iterated function systems (IFS)<br />
<br />
;[http://cvs.haskell.org/darcs/numeric-quest/ Mirror of the following numeric modules by Jan Skibinski]<br />
:<br />
*[http://web.archive.org/web/*/http://www.numeric-quest.com/haskell/fractions.html Numerics with fractions]<em>(via Internet Archive since 10/06/2003).</em><br />
*[http://web.archive.org/web/*/http://www.numeric-quest.com/haskell/Roots.html Roots of polynomials]<em>(via Internet Archive since 10/06/2003).</em> It implements the well known Laguerre's method for finding complex roots of polynomials.<br />
*[http://web.archive.org/web/*/http://www.numeric-quest.com/haskell/Orthogonals.html Indexless linear algebra algorithms]<em>(via Internet Archive since 10/06/2003).</em> Orthogonalization, solution of linear equations, eigenvalues and eigenvectors.<br />
* [http://web.archive.org/web/*/http://www.numeric-quest.com/haskell/ State vector evolution]<em>(via Internet Archive since 10/06/2003)</em><br />
* [http://web.archive.org/web/*/http://www.numeric-quest.com/haskell/ Short study of fuzzy oscillator]<em>(via Internet Archive since 10/06/2003)</em><br />
* [http://web.archive.org/web/*/http://www.numeric-quest.com/haskell/Tensor.html N-dimensional tensors]<em>(via Internet Archive since 10/06/2003)</em><br />
<br />
;[http://www.dinkla.net/fp/cglib.html Geometric Algorithms]<br />
:A small Haskell library, containing algorithms for two-dimensional convex hulls, triangulations of polygons, Voronoi-diagrams and Delaunay-triangulations, the QEDS data structure, kd-trees and range-trees.<br />
<br />
;[http://repetae.net/john/recent/out/HsASA.html Adaptive Simulated Annealing]<br />
:A Haskell interface to Lester Ingber's adaptive simulating annealing code.<br />
<br />
;[http://www.solcon.nl/mklooster/repos/hmm/ Hmm: Haskell Metamath]<br />
:Hmm is a small Haskell library to parse and verify Metamath databases.<br />
<br />
;[http://eecs.oregonstate.edu/~erwig/pfp/ Probabilistic Functional Programming]<br />
:The PFP library is a collection of modules for Haskell that facilitates probabilistic functional programming, that is, programming with stochastic values. The probabilistic functional programming approach is based on a data type for representing distributions. A distribution represent the outcome of a probabilistic event as a collection of all possible values, tagged with their likelihood. A nice aspect of this system is that simulations can be specified independently from their method of execution. That is, we can either fully simulate or randomize any simulation without altering the code which defines it.<br />
<br />
;[[Sinc function]]<br />
<br />
;[http://repetae.net/john/recent/out/Boolean.html Boolean]<br />
:A general boolean algebra class and some instances for Haskell.<br />
<br />
;[http://darcs.haskell.org/~lemmih/hode/ HODE]<br />
:HODE is a binding to the Open Dynamics Engine. ODE is an open source, high performance library for simulating rigid body dynamics.<br />
<br />
;[http://sourceforge.net/projects/ranged-sets Ranged Sets]<br />
:A ranged set is a list of non-overlapping ranges. The ranges have upper and lower boundaries, and a boundary divides the base type into values above and below. No value can ever sit on a boundary. So you can have the set <math>(2.0, 3.0] \cup (5.3, 6)</math>.<br />
<br />
[[Category:Mathematics]]<br />
{{LibrariesPage}}</div>Emkhttps://wiki.haskell.org/index.php?title=Applications_and_libraries/Mathematics&diff=10600Applications and libraries/Mathematics2007-01-21T15:05:43Z<p>Emk: Added link to GSL Haskell for MacOS X page</p>
<hr />
<div>== Applications ==<br />
<br />
=== Physics ===<br />
<br />
;[http://ab-initio.mit.edu/meep/ Meep]<br />
:Meep (or MEEP) is a free finite-difference time-domain (FDTD) simulation software package developed at MIT to model electromagnetic systems.<br />
<br />
== Libraries ==<br />
<br />
=== Linear algebra ===<br />
<br />
;[http://dis.um.es/~alberto/GSLHaskell GSLHaskell]<br />
:High level functional interface to standard linear algebra computations and other numerical algorithms based on the GNU Scientific Library. [http://alberrto.googlepages.com/gslhaskell Alternative download site], [[GSL Haskell on MacOS X|MacOS X].<br />
<br />
;[http://www.cs.utah.edu/~hal/HBlas/index.html Wrapper to CLAPACK]<br />
<br />
;[http://haskelldsp.sourceforge.net/ Digital Signal Processing]<br />
:Modules for matrix manipulation, digital signal processing, spectral estimation, and frequency estimation.<br />
<br />
;[http://article.gmane.org/gmane.comp.lang.haskell.general/13561 Index-aware linear algebra]<br />
:Frederik Eaton's library for statically checked matrix manipulation in Haskell<br />
<br />
;[http://cvs.haskell.org/darcs/numeric-quest/Orthogonals.html Indexless linear algebra]<br />
:algorithms by Jan Skibinski, see below<br />
<br />
See also: [[Linear algebra|Design discussions]]<br />
<br />
=== [[Physical units]] ===<br />
<br />
;[[Dimensionalized numbers]]<br />
: Working with physical units like second, meter and so on in a type-safe manner.<br />
<br />
;[http://darcs.haskell.org/numericprelude/src/Number/SI.hs NumericPrelude: Physical units]<br />
: Numeric values with dynamically checked units.<br />
<br />
;[[CalDims]]<br />
:This is not simply a library providing a new type of <hask>Num</hask> class, but stand-alone calculation tool that supports user defined functions and units (basic and derrived), so it can provide dimension-save calculation (not embedded but via shell). Calculations can be modified/saved via shell. It uses rational numbers to avoid rounding errors where possible.<br />
<br />
=== Number representations ===<br />
<br />
;[http://www.n-heptane.com/nhlab/repos/Decimal Decimal arithmetic library]<br />
:An implementation of real decimal arithmetic, for cases where the binary floating point is not acceptable (for example, money).<br />
<br />
There are several levels of [[Exact real arithmetic|handling real numbers]] and according libraries.<br />
<br />
==== Arbitrary precision ====<br />
<br />
* Numbers have fixed precision<br />
* Rounding errors accumulate<br />
* Sharing is easy, i.e. in <hask>sqrt pi + sin pi</hask>, <hask>pi</hask> is computed only once<br />
* Fast, because the routines can make use of the fast implementation of <hask>Integer</hask> operations<br />
<br />
;[http://cvs.haskell.org/darcs/numeric-quest/Fraction.hs Fractions.hs]<br />
:algorithms by Jan Skibinski, see below<br />
<br />
;[http://cvs.haskell.org/darcs/numericprelude/src/Number/FixedPoint.hs FixedPoint.hs]<br />
:part of NumericPrelude project<br />
<br />
==== Dynamic precision ====<br />
<br />
* You tell the precision, an expression shall be computed to and the computer finds out, how precise to compute the input values.<br />
* Rounding errors do not accumulate<br />
* Sharing of temporary results is difficult, that is in <hask>sqrt pi + sin pi</hask>, <hask>pi</hask> will certainly be computed twice, each time with the required precision.<br />
* Almost as fast as arbitrary precision computation<br />
<br />
;[http://www.cs.man.ac.uk/arch/dlester/exact.html ERA] is an implementation (in Haskell 1.2) by David Lester.<br />
:It is quite fast, possibly the fastest Haskell implementation. At 220 lines it is also the shortest. Probably the shortest implementation of exact real arithmetic in any language.<br />
:Here is a mirror: http://darcs.augustsson.net/Darcs/CReal/<br />
<br />
;[http://www.doc.ic.ac.uk/~ae/exact-computation/#bm:implementations IC-Reals] is an implementation by Abbas Edalat, Marko Krznar&#263; and Peter J. Potts.<br />
:This implementation uses linear fractional transformations.<br />
<br />
;[http://r6.ca/ Few Digits] by Russell O'Connor.<br />
:This is a prototype of the implementation he intendeds to write in [http://coq.inria.fr/ Coq]. Once the Coq implementation is complete, the Haskell code could be extracted producing an implementation that would be proved correct.<br />
<!--<br />
Example:<br />
*Data.Real.CReal> answer 1000 (exp 1 + sqrt 2)<br />
--><br />
<br />
;COMP is an implementation by Yann Kieffer.<br />
:The work is in beta and relies on new primitive operations on Integers which will be implemented in GHC. The library isn't available yet.<br />
<br />
==== Dynamic precision by lazy evaluation ====<br />
<br />
The real numbers are represented by an infinite datastructure, which allows you to increase precision successively by evaluating the data structure successively. All of the implementations below use some kind of digit stream as number representation.<br />
Sharing of results is simple.<br />
The implementations are either fast on simple expressions, because they use large blocks/bases, or they are fast on complex expressions, because they consume as little as possible input digits in order to emit the required output digits.<br />
<br />
;[http://medialab.freaknet.org/bignum/ BigFloat] is an implementation by Martin Guy.<br />
:It works with streams of decimal digits (strictly in the range from 0 to 9) and a separate sign. The produced digits are always correct. Output is postponed until the code is certain what the next digit is. This sometimes means that [http://medialab.freaknet.org/bignum/dudeney.html no more data is output].<br />
<br />
;In [http://users.info.unicaen.fr/~karczma/arpap/lazypi.ps.gz "The Most Unreliable Technique in the World to compute pi"] Jerzy Karczmarczuk develops some functions for computing pi lazily.<br />
<br />
;[http://darcs.haskell.org/numericprelude/src/Number/Positional.hs NumericPrelude: positional numbers]<br />
:Represents a real number as pair <hask>(exponent,[digit])</hask>, where the digits are <hask>Int</hask>s in the open range <hask>(-basis,basis)</hask>. There is no need for an extra sign item in the number data structure. The <hask>basis</hask> can range from <hask>10</hask> to <hask>1000</hask>. (Binary representations can be derived from the hexadecimal representation.) Showing the numbers in traditional format (non-negative digits) fails for fractions ending with a run of zeros. However the internal representation with negative digits can always be shown and is probably more useful for further processing. An interface for the numeric type hierarchy of the NumericPrelude project is provided.<br />
:It features<br />
:* basis conversion<br />
:* basic arithmetic: addition, subtraction, multiplication, division<br />
:* algebraic arithmetic: square root, other roots (no general polynomial roots)<br />
:* transcendental arithmetic: pi, exponential, logarithm, trigonometric and inverse trigonometric functions<br />
<br />
=== Type class hierarchies ===<br />
<br />
There are several approaches to improve the [[Mathematical prelude discussion|numeric type class hierarchy]].<br />
<br />
;Dylan Thurston and Henning Thielemann's [http://cvs.haskell.org/darcs/numericprelude/ Numeric Prelude]<br />
:Experimental revised framework for numeric type classes. Needs hiding of Prelude, overriding hidden functions like fromInteger and multi-parameter type classes. Probably restricted to GHC.<br />
<br />
;Jerzy Karczmarczuk's [http://www.haskell.org/pipermail/haskell-cafe/2001-February/001510.html approach]<br />
<br />
;Serge D. Mechveliani's [ftp://ftp.botik.ru/pub/local/Mechveliani/basAlgPropos/ Basic Algebra proposal]<br />
<br />
;Andrew Frank's [http://www.haskell.org/pipermail/haskell-cafe/2006-April/015326.html approach]<br />
:The proposal: ftp://ftp.geoinfo.tuwien.ac.at/frank/numbersPrelude_v1.pdf<br />
<br />
;Haskell Prime: [http://hackage.haskell.org/trac/haskell-prime/ticket/112 Ongoing efforts for the language revision]<br />
<br />
=== Discrete mathematics ===<br />
<br />
;[http://andrew.bromage.org/darcs/numbertheory/ Number Theory Library]<br />
:Andrew Bromage's Haskell number theory library, providing operations on primes, fibonacci sequences and combinatorics.<br />
<br />
;[http://users.skynet.be/jyp/HGAL/ HGAL]<br />
:An haskell implementation of Brendan McKay's algorithm for graph canonic labeling and automorphism group. (aka Nauty)<br />
<br />
;[http://www.cambridge.org/uk/catalogue/catalogue.asp?isbn=0521849306 Computational Oriented Matroids]<br />
:is a book by [http://wwwopt.mathematik.tu-darmstadt.de/~bokowski/ Jürgen G. Bokowski], where he develops Haskell code for Matroid computations.<br />
<br />
See also [[Libraries and tools/Cryptography]]<br />
<br />
=== Computer Algebra ===<br />
<br />
;[http://haskell.org/docon/ DoCon] - Algebraic Domain Constructor<br />
:A library for Algebra, turns GHCi into a kind of Computer Algebra System<br />
<br />
;[http://www.info.unicaen.fr/~karczma/arpap/ Papers by Jerzy Karczmarczuk]<br />
:Some interesting uses of Haskell in mathematics, including functional differentiation, power series, continued fractions.<br />
<br />
=== Miscellaneous libraries ===<br />
<br />
;[http://www.robtougher.com/HaskellMath/ HaskellMath]<br />
:The HaskellMath library is a sandbox for experimenting with mathematics algorithms. So far I've implemented a few quantitative finance models (Black Scholes, Binomial Trees, etc) and basic linear algebra functions. Next I might work on either computer algebra or linear programming. All comments welcome!<br />
<br />
;[http://www.polyomino.f2s.com/david/haskell/codeindex.html Haskell for Maths]<br />
:David Amos' [http://www.polyomino.f2s.com/david/haskell/main.html collection of math libraries] in Haskell - including number theory, commutative algebra, combinatorics, permutation groups and more.<br />
<br />
;[http://darcs.haskell.org/htam/ Various math stuff by Henning Thielemann]<br />
:This is some unsorted mathematical stuff including: GNUPlot wrapper, portable grey map (PGM) image reader and writer, simplest numerical integration, differentiation, zero finding, interpolation, solution of differential equations, combinatorics, some solutions of math riddles, computation of fractal dimensions of iterated function systems (IFS)<br />
<br />
;[http://cvs.haskell.org/darcs/numeric-quest/ Mirror of the following numeric modules by Jan Skibinski]<br />
:<br />
*[http://web.archive.org/web/*/http://www.numeric-quest.com/haskell/fractions.html Numerics with fractions]<em>(via Internet Archive since 10/06/2003).</em><br />
*[http://web.archive.org/web/*/http://www.numeric-quest.com/haskell/Roots.html Roots of polynomials]<em>(via Internet Archive since 10/06/2003).</em> It implements the well known Laguerre's method for finding complex roots of polynomials.<br />
*[http://web.archive.org/web/*/http://www.numeric-quest.com/haskell/Orthogonals.html Indexless linear algebra algorithms]<em>(via Internet Archive since 10/06/2003).</em> Orthogonalization, solution of linear equations, eigenvalues and eigenvectors.<br />
* [http://web.archive.org/web/*/http://www.numeric-quest.com/haskell/ State vector evolution]<em>(via Internet Archive since 10/06/2003)</em><br />
* [http://web.archive.org/web/*/http://www.numeric-quest.com/haskell/ Short study of fuzzy oscillator]<em>(via Internet Archive since 10/06/2003)</em><br />
* [http://web.archive.org/web/*/http://www.numeric-quest.com/haskell/Tensor.html N-dimensional tensors]<em>(via Internet Archive since 10/06/2003)</em><br />
<br />
;[http://www.dinkla.net/fp/cglib.html Geometric Algorithms]<br />
:A small Haskell library, containing algorithms for two-dimensional convex hulls, triangulations of polygons, Voronoi-diagrams and Delaunay-triangulations, the QEDS data structure, kd-trees and range-trees.<br />
<br />
;[http://repetae.net/john/recent/out/HsASA.html Adaptive Simulated Annealing]<br />
:A Haskell interface to Lester Ingber's adaptive simulating annealing code.<br />
<br />
;[http://www.solcon.nl/mklooster/repos/hmm/ Hmm: Haskell Metamath]<br />
:Hmm is a small Haskell library to parse and verify Metamath databases.<br />
<br />
;[http://eecs.oregonstate.edu/~erwig/pfp/ Probabilistic Functional Programming]<br />
:The PFP library is a collection of modules for Haskell that facilitates probabilistic functional programming, that is, programming with stochastic values. The probabilistic functional programming approach is based on a data type for representing distributions. A distribution represent the outcome of a probabilistic event as a collection of all possible values, tagged with their likelihood. A nice aspect of this system is that simulations can be specified independently from their method of execution. That is, we can either fully simulate or randomize any simulation without altering the code which defines it.<br />
<br />
;[[Sinc function]]<br />
<br />
;[http://repetae.net/john/recent/out/Boolean.html Boolean]<br />
:A general boolean algebra class and some instances for Haskell.<br />
<br />
;[http://darcs.haskell.org/~lemmih/hode/ HODE]<br />
:HODE is a binding to the Open Dynamics Engine. ODE is an open source, high performance library for simulating rigid body dynamics.<br />
<br />
;[http://sourceforge.net/projects/ranged-sets Ranged Sets]<br />
:A ranged set is a list of non-overlapping ranges. The ranges have upper and lower boundaries, and a boundary divides the base type into values above and below. No value can ever sit on a boundary. So you can have the set <math>(2.0, 3.0] \cup (5.3, 6)</math>.<br />
<br />
[[Category:Mathematics]]<br />
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