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Re: [Help-gnucap] Gnu cap src help

From: Felix Salfelder
Subject: Re: [Help-gnucap] Gnu cap src help
Date: Fri, 24 Aug 2012 18:49:56 +0200
User-agent: Mutt/1.5.20 (2009-06-14)

Hi Chris

On Fri, Aug 24, 2012 at 03:59:24AM -0700, _griv wrote:
> What i really want to do is understand the 
> way the information of the netlist is 
> stored into matrices

much of the resistor implementation is done in ELEMENT. as such, a
resistor has a node_t _nodes[]. a node_t holds the number of the netlist
node ("user number"), accessed by t_(), and the number of the matrix
column/row ("matrix number"), accessed by m_(), the node corresponds to.
user numbers are mapped to matrix numbers within map_nodes(), before the
simulation starts.

> and how the modeling of 
> resistor networks is done, in order to be able to apply
> an algorithm which aims to the reduction of large resistor networks.

is there any reason why you chose gnucap? gnucap does a lot to do fast
numerical simulation of electrical networks, which is hardly needed for
network reduction. also, a resistor network can be easily represented by
a triangular incidence matrix over nonnegative numbers. using the gnucap
data structures looks like overkill...

but of course i might be missing something, i'm just curious.


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