Difference between revisions of "Physical units/CalDims"
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The motivation for writing CalDims was to have an easy to use calculation tool that has support for units. | The motivation for writing CalDims was to have an easy to use calculation tool that has support for units. | ||
| − | ==The calculator's features== | + | == The calculator's features == |
* Support for user defined basic units and derrived units | * Support for user defined basic units and derrived units | ||
| Line 10: | Line 10: | ||
* easy unit-conversion | * easy unit-conversion | ||
| − | == | + | == Example session == |
| − | * | + | <haskell> |
| − | * | + | > # A bird is moving 1 meter per second, how far will it be in 2 hours? |
| − | + | > 1m/s * 2h | m | |
| + | 7200 m | ||
| + | > # A 60 Watt electric light is burning 2 hours a day. How much energy is consumed in one week? | ||
| + | > 60 W * 2 h / d * 7 d | J | ||
| + | 3024000 J | ||
| + | > # What's that in Watt hours? | ||
| + | > 60 W * 2 h / d * 7 d | W h | ||
| + | 840 W h | ||
| + | > #How much is it in a year (we derrive `year` first) | ||
| + | > year := 265 d | ||
| + | ok. | ||
| + | > 60 W * 2 h / d * 1 year | W h | ||
| + | 31799.999999999996 W h | ||
| + | > # Bits and bytes are not defined. We do so: | ||
| + | > \u bit | ||
| + | ok, but an object has changed | ||
| + | > byte := 8 bit | ||
| + | ok, but an object has changed | ||
| + | > kbyte := 1024 byte | ||
| + | ok. | ||
| + | > mbyte := 1024 kbyte | ||
| + | ok. | ||
| + | > 2 mbyte | - | ||
| + | 16777216 bit | ||
| + | > 2 mbyte | kbyte | ||
| + | 2048 kbyte | ||
| + | </haskell> | ||
| + | == Sources == | ||
| − | + | darcs http://tel.netbeisser.de/darcs/CalDims | |
| − | + | darcs http://tel.netbeisser.de/darcs/CalDimsApps | |
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[[Category:Applications]] | [[Category:Applications]] | ||
[[Category:Mathematics]] | [[Category:Mathematics]] | ||
Revision as of 11:41, 24 September 2007
The motivation for writing CalDims was to have an easy to use calculation tool that has support for units.
The calculator's features
- Support for user defined basic units and derrived units
- user defined functions
- work sheets can be modified/saved via shell
- (1/3)*3 == 1 (No rounding errors)
- built-in feature to simplify units
- easy unit-conversion
Example session
> # A bird is moving 1 meter per second, how far will it be in 2 hours?
> 1m/s * 2h | m
7200 m
> # A 60 Watt electric light is burning 2 hours a day. How much energy is consumed in one week?
> 60 W * 2 h / d * 7 d | J
3024000 J
> # What's that in Watt hours?
> 60 W * 2 h / d * 7 d | W h
840 W h
> #How much is it in a year (we derrive `year` first)
> year := 265 d
ok.
> 60 W * 2 h / d * 1 year | W h
31799.999999999996 W h
> # Bits and bytes are not defined. We do so:
> \u bit
ok, but an object has changed
> byte := 8 bit
ok, but an object has changed
> kbyte := 1024 byte
ok.
> mbyte := 1024 kbyte
ok.
> 2 mbyte | -
16777216 bit
> 2 mbyte | kbyte
2048 kbyte