On Aug 11, 4:29 pm, William Stein <wst...@gmail.com> wrote:
> I just wanted to let people know that David Ackerman -- a UW student who
> took my course on Sage last quarter -- is working (funded by NSF) on
> creating a "units package" for Sage right _now_. If anybody has any
> pseudo-sage code that involves units that they wished work, please post it
> to this thread. What do you want units to *do*?
I'm assuming you mean physical units, not something algebraic.
I'm rather fond of the ezunits package in Maxima.
(Disclaimer: I wrote it.) I tried to exploit symbolic computation
in useful ways; I'll let you be the judge of it.
* a quantity and its units comprise an expression
which can be mangled in the usual ways
* clear, terse notation for units and unit conversion
* quantities can be anything (symbol, list, matrix, etc)
* units are ordinary symbols, need not be declared before use
* usual lazy evaluation of arithmetic on quantity + units
* unit conversion = solving equations
* favor exact quantities (not automatically floatified)
* symbols can be declared to have units
* includes dimensional analysis
* includes a list of physical quantities represented
as symbols with units and other properties
* derivative and integral of quantity + units via pattern matching
(still working on this one)
?? ezunits and ?? physical_quantities finds the documentation.
demo(ezunits) shows some examples.
Maybe a Sage units package could do something similar.
FWIW
Robert Dodier
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