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To: geda-user AT delorie DOT com
cc: karl AT aspodata DOT se
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Subject: Re: [geda-user] Translating SI notation to SPICE
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Comments: In-reply-to Evan Foss <evanfoss AT gmail DOT com>
   message dated "Tue, 11 Dec 2012 08:49:15 -0500."
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Date: Tue, 11 Dec 2012 15:17:22 +0100 (CET)
From: karl AT aspodata DOT se (Karl Hammar)
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--------
Evan Foss:
> On Tue, Dec 11, 2012 at 3:00 AM, Karl Hammar <karl AT aspodata DOT se> wrote:
...
> > Why not write it as an engineer/scientist would do it?
> > E.g. 10 Hz, 10Hz, 10 1/s, 15 A/V, 25 m/s2, 2e-4mmol, 3 km/ms, 3 V/As ...
> >
> > It cannot be that hard to parse that, something like:
> >
> > value : number dimension
> > dimension : tdimension | tdimension "/" tdimension
> > tdimension : "" | "1" | prefix unit | tdimension sep tdimension |
> >              tdimension exponent | "(" tdimension ")" exponent
> > sep : " " | "*"

> I don't like that because it would mean 4.7u/F which looks so wrong.

What "would mean 4.7 u/F"? That wouldn't be legal since a prefix must be 
followed by a unit by the above rule-sort-of.

> Besides there are people who do math in gschem and that use of the
> division symbol would be a mess for them.

I don't understand that reasoning, people doing math don't have any
problem with divisions. The problem is to handle any attached units 
at all.

> Multiplication would be ok
> if not ugly.

So you accept * but not / ?
You need the / thing if you want V/m or do you rather want to write
it Vm-1.

> I know mathcad does it that way.

Sorry, I don't know mathcad, I cannot comment on that.

Regards,
/Karl Hammar

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