mfey / units2 Goto Github PK
View Code? Open in Web Editor NEWA Clojure library for units of measurement.
License: Eclipse Public License 1.0
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provide compound units
javax.measure.unit has a compoundUnit class that might be worth reproducing (or wrapping) in units2.
The typical use case might be for human-readable times (hh:mm:ss), but I can also see some use for compound units in proportions (e.g. a tasty recipe egg:flour:sugar:butter, or a neutrino flavour ratio) and vector quantities (e.g. a spatial vector x:y:z).
In all of the above, we read : as "and"; we could also imagine compound units as encoding alternatives and read : as "or" (e.g. a resource management game might have a cost payable in either in lumber or in stone, or a spacetime separation might be interpreted either as a distance or as a duration). Is this variation on compound units also reasonable to implement?
leaky abstraction in `makebaseunit`
(makebaseunit <string>) is currently just a layer of syntactic sugar over JScience's BaseUnit.
If we try to use the name of a unit already defined in JScience's Unit/SI as the name of a new dimension, we get an exception. This is clearly a bug.
At the repl:
user=> (require '[units2.IFnUnit :refer [defbaseunit]])
nil
user=> (defbaseunit s "G")
#'user/s
user=> (defbaseunit s "H") ; Henry
CompilerException java.lang.IllegalArgumentException: Symbol H is associated to a different unit, compiling:(form-init######.clj:1:1)
user=> (defbaseunit s "I")
#'user/s
user=> (defbaseunit s "J") ; Joule
CompilerException java.lang.IllegalArgumentException: Symbol J is associated to a different unit, compiling:(form-init######.clj:1:1)
user=> (defbaseunit s "K") ; Kelvin, so expect exception, but it seems to work?
#'user/sIntriguingly, using units from Unit/NonSI is just fine:
user=> (defbaseunit s "a") ; are
#'user/s
user=> (defbaseunit s "b")
#'user/s
user=> (defbaseunit s "c") ; speed of light
#'user/s
user=> (defbaseunit s "d") ; day
#'user/s
user=> (defbaseunit s "e") ; positron charge
#'user/sAn exception to this exceptional behaviour (!) occurs for Baseunits defined in Unit/SI themselves ("A", "cd", "K", "kg", "m", "mol", "s"), which seem to work just fine at a first glance but actually don't do what you'd expect!
user=> (defbaseunit s "A") ; ampere -> intensity
#'user/s
user=> (.getDimension s)
#object[javax.measure.unit.Dimension 0x29559cae "[I]"]
user=> (defbaseunit s "cd")
#'user/s
user=> (.getDimension s)
#object[javax.measure.unit.Dimension 0x22759915 "[L]²·[M]/[T]³"]
user=> (defbaseunit s "K")
#'user/s
user=> (.getDimension s)
#object[javax.measure.unit.Dimension 0x724b8f81 "[θ]"]
user=> (defbaseunit s "s") ; second -> time
#'user/s
user=> (.getDimension s)
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