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From: "martin.m.dowie" <martin.m.dowie@ntlworld.com>
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Subject: Re: Announce: Grace project site operational
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Date: Sat, 11 May 2002 17:58:55 +0100
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"Preben Randhol" <randhol+abuse@pvv.org> wrote in message
news:slrnadq9vg.21p.randhol+abuse@kiuk0156.chembio.ntnu.no...
> On Fri, 10 May 2002 11:38:14 -0400, Marin David Condic wrote:
> > Example: There are times when one might want to have unique types for
> > Volts and Amps and Ohms (reading from different sensors) and there are
> > times when this would only be extremely painful (when calculating
> > typical electrical relationships) and what exactly would the type
> > conversions mean anyway? If I say "Amps := Amps_Type (Volts) /
> > Amps_Type (Ohms) ;" am I really converting volts to amps and ohms to
> > amps as it appears? Not exactly as it reads. So there can be an awful
> > large amount of gray area in deciding when to create types and when
> > doing so is going to just make things worse. But I can usually spot
> > "worse" when I see it. :-)
>
> I agree.
>
[snip]

In these sorts of cases I would use an 'SI_Units' package (like the
"Whitaker"
one) that provided all the nice conversion for me...

e.g. function "/" (V : Volts; O : Ohms) return Amps;

etc

I find this _very_ convenient and highly reusable.

Anyone for a 'Grace.SI_Units' package?..