Re: [Ngspice-users] ngSpice: Manipulating/Retrieving MNA matrices after netlisting

[Victor B. <vi...@ty...>]

Hi,

I did not do anything of that nature, but this may pass as a pointer, I think.

MNA = modified nodal admittance? the way those sparce matrices are constructed 
is indirectly described in the dissertation of Thomas L. Quarles which was 
available from SPICE3f5 page 
(embedded.eecs.berkeley.edu/pubs/downloads/spice/spice.html). May be you still 
can find it somewhere. Some other books on SPICE may mention how these matrices 
are stored and manipulated.

If you are looking at the source code, I hope you are looking at src/math/sparce 
?

Good luck,
Victor

> Dear all,
> 
> I recently found out about ngSpice and have begun experimenting with it. So
> far I have really been impressed with the fact that ngSpice is as
> fast/accurate/featureful as some of the commerical simulators out there...
> 
> Currently I am trying to find out how to manipulate the MNA matrices that
> are constructed by ngSpice, just to see how easy it would be to
> append/improve on algorithms that are currently being used by ngSpice.
> 
> I think it would really be interesting to see how much of a performance
> enhancement ngSpice would get if some of those Model Order reduction
> algorithms were implemented into the ngSpice framework. :)
> 
> Has anyone attemped to do something of this nature before? If so, could you
> please drop me a few pointers on where I would start... Unfortunately, its
> hard for me to figure out what happening by merely looking at the source
> code alone...
> 
> Thanks,
> 
> Sincerely,
> 
> -------------------
> Taha Amiralli
> thamiral [A] uwo [D] ca
> thamiral [A] gmail [D] com
> 
> MESc Candidate 2007, Computer Engineering
> The University Of Western Ontario
> 
> BESc, BSc. 2005,
> Computer Engineering & Computer Science
> The University Of Western Ontario
> ---------------------------------------------------------------