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Re: [Gnucap-devel] workarounds for the lack of nodeset

From: al davis
Subject: Re: [Gnucap-devel] workarounds for the lack of nodeset
Date: Fri, 26 Jul 2019 20:57:40 -0400

I never had a need for nodeset, but it looks fairly easy to do.

In Spice, it works by jamming non-ideal sources into the matrix, 1 ohm
in parallel with a current source is close enough to a voltage source.

On DC or starting tran ..
First converge with sources in.
Then take them out and converge again.

Coding recommendations for gnucap ......

A single plugin file should do it.

The command ..  builds a subckt with a bunch of sources, and
instantiates it.

The sources would be the non-ideal voltage source (V) or a G device
with a special bm_ (plugin)

The bm_ .. would fiddle the value according to status, effectively
removing itself ... f1=1 to start, then 0.  f0=voltage to start, then
0.  and sense something to change state.

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