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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 10:45:22 +0200
User-agent: Mutt/1.5.20 (2009-06-14)

On Fri, Aug 24, 2012 at 01:13:36AM -0700, _griv wrote:
> Does anybody know where in the source code of Gnucap i can find the algorithm
> used to convert the netlist inserted into nodes in order to take place the
> nodal analysis and LU decomposition for analog simulation. 

Hi Chris.

it roughly looks like this:

while the netlist ist parsed, devices are stashed into a CARDLIST, see, LANGUAGE::new__instance(...). that cardlist reappears in
SIM_DATA::init() (, here "expand", "map_nodes" and
"*iwant_matrix" are called on all devices. after this, all devices are
present and know where to write their matrix contributions. then look at, solve(). here, evaluate_models() tells the devices to add
their contribution to the matrix & right hand side, solve_equations
finally does the LU decomposition and calculates the preimage _sim->_v0.

there are more things happening, of course. feel free to ask for
details. what are you trying to do?


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