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Date: Tue, 11 Dec 2012 10:42:25 -0500
Message-ID: <CAM2RGhRvmDP2NjKwbR=Ph8e_X+mNW8aww-JBqcjWaTMLLjPDVA@mail.gmail.com>
Subject: Re: [geda-user] Translating SI notation to SPICE
From: Evan Foss <evanfoss AT gmail DOT com>
To: geda-user AT delorie DOT com
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Precedence: bulk

What if someone actually wants to write km/s as in kilo meters per second?

On Tue, Dec 11, 2012 at 9:17 AM, Karl Hammar <karl AT aspodata DOT se> wrote:
> --------
> 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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> S-742 94 Östhammar
> Sweden
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>
>



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