Re: [Help-gnucap] Gnu cap src help

[Felix Salfelder]

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
u_lang.cc, LANGUAGE::new__instance(...). that cardlist reappears in
SIM_DATA::init() (u_sim_data.cc), 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
s__solve.cc, 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?

regards
felix

-- 
()  ascii ribbon campaign - against html e-mail
/\  www.asciiribbon.org   - against proprietary attachments