This is very, very cool. The implementation does seems to suggest some interesting potential way that Base could support this better. Please don't hesitate to bring these up as issues or on julia-dev. Really smooth support for units in Julia is a killer feature.
On Fri, Feb 12, 2016 at 3:23 PM, Andrew Keller <andrew.keller...@gmail.com> wrote: > I'm happy to share a package I wrote for using physical units in Julia, > Unitful.jl <https://www.github.com/ajkeller34/Unitful.jl>. Much credit > and gratitude is due to Keno Fischer for the SIUnits.jl > <https://www.github.com/keno/SIUnits.jl> package which served as my > inspiration. This is a work in progress, but I think perhaps a serviceable > one depending on what you're doing. > > Like SIUnits.jl, this package encodes units in the type signature to avoid > run-time performance penalties. From there, the implementations diverge. > The package is targeted to Julia 0.5 / master, as there are some > limitations with how promote_op is used in Julia 0.4 (#13803) > <https://github.com/JuliaLang/julia/pull/13803>. I decided it wasn't > worth targeting 0.4 if the behavior would be inconsistent. > > Some highlights include: > > - Non-SI units are treated on the same footing as SI units, with only > a few exceptions (unit conversion method). Use whatever weird units > you want. > - Support for units like micron / (meter Kelvin), where some of the > units could cancel out but you don't necessarily want them to. > - Support for LinSpace and other Range types. Probably there are still > some glitches to be found, though. > - Support for rational exponents of units. > - Some tests (see these for usage examples). > > Please see the documentation for a comprehensive discussion, including > issues / to do list, as well as how to add your own units, etc. > Comments and feedback are welcome. > > Best, > Andrew Keller >
