[racket] Numbers with dimensions

On Wed, Oct 30, 2013 at 10:32 AM, Konrad Hinsen
<konrad.hinsen at fastmail.net>wrote:

> Laurent writes:
>
>  > Pushed: https://github.com/Metaxal/measures#4-dimensions-and-contracts
>
> This is getting better and better every day! The use of contracts looks
> like the best way to do run-time dimensional analysis.
>

Thanks, that's mainly thanks to your feedback.

My only remaining wish is to be able to define my own set of units and
> prefixes, i.e. factor out the second half of convert.rkt. Unfortunately
> this doesn't look straightforward, because it must be possible to
> use multiple unit systems in the same Racket instance. It might actually
> be best to have a specific module per unit system, as there are not
> so many useful ones anyway. Each client module would then require the
> module with the unit system it needs, i.e. measures/si or measures/atomic.
>

The units are now in a separate file but I did not try to build another
base.
But at least it's possible to require only measures/measure and
measures/convert
and define one's own set of dimensions and units.

I also added the list of chemical elements (just for fun), parsed
automatically from Wikipedia's page:
https://github.com/Metaxal/measures#5-chemical-elements

Laurent
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