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Subject: Re: [geda-user] XML file format (what could be expected)
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From: John Doty <jpd AT noqsi DOT com>
In-Reply-To: <20151230180007.B4391809D79B@turkos.aspodata.se>
Date: Wed, 30 Dec 2015 11:44:57 -0700
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On Dec 30, 2015, at 11:00 AM, karl AT aspodata DOT se wrote:

> Nicklas Karlsson:
>>> On Dec 20, 2015, at 6:34 AM, karl AT aspodata DOT se wrote:
>>>=20
>>>> I'd like to be able to do, gschem:
>>>>=20
>>>> . give parameters to subsheets, like
>>>> output is to be 12V select suitable resistor devider
>>>> this filter has this freq., select suitable components
>>>=20
>>> Neither gschem nor the schematic file format need any
>>> modification to do this. It works nicely with SPICE. It=92s a
>>> downstream issue.
>=20
> Ok, that is one way to do it. I meant more that I wanted gschem to
> be able to show alt. the formula or the result, i.e. with the
> parameter/formula applied.

OK, so go with the logic of the tool and write Scheme scripts to do =
this.

The idea that something=92s wrong with gschem because it doesn=92t have =
<insert favorite feature> builtin strikes me as an invitation to chaos =
and bloat. It=92s like complaining that TeX has no built-in concept of =
what a paragraph is.

>=20
>>> If you=92re doing this for layout in a big project, I think
>>> you probably want the capability to use automatically generated
>>> schematic files as your intermediates. The reason is that there=92s
>>> a subset of reviewers and technicians who find hierarchy
>>> challenging, and parameterized hierarchy will be even more
>>> confusing.
>=20
> Strange, we live in world multiple hierarchies (the company, home,
> state, etc). Do you have any idea why ?

I think it=92s related to a preference for step-by-step thinking. I =
contribute to the Mathematica Stack Exchange group, and the most common =
thing I see that makes code hard to understand and debug is that some =
insist on coding step by step with For[] rather than transforming whole =
structures with Map[], Thread[], etc. The same thing applies to those =
who struggle with Scheme, I think.

>=20
>> Yes parameterized hierarchy would probably be hard to get simple
>> and easy to understand and otherwise it would only add confusion
>> while it is supposed to make things easier. I use to add
>> calculations as a text or possible some text about where
>> calculations or suitable documentation could be found.
>=20
> Parameters (or what to call it) is part of the design process so it
> should be natural to have them in a schemata. So the problem is to
> make gschem to show either the formula as is or it evaluated.
>=20
> Regards,
> /Karl Hammar
>=20
> =
-----------------------------------------------------------------------
> Asp=F6 Data
> Lilla Asp=F6 148
> S-742 94 =D6sthammar
> Sweden
> +46 173 140 57
>=20
>=20
>=20

John Doty              Noqsi Aerospace, Ltd.
http://www.noqsi.com/
jpd AT noqsi DOT com



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