Re: [Ngspice-devel] gshunt and rshunt

[Stefan J. <ste...@mu...>]

On Mon, 2003-07-14 at 20:54, Paolo Nenzi wrote:

> - Compatibility: to be compatible with xspice, i think that both options
> should be implemented, adding an option like "shuntopt":
> 
> shuntopt = 0 (default) -> Alan's scheme (ngspice default)
> shuntopt = 1           -> xspice r-shunt scheme
> 
> Doing this we can test (tcl/ng)spice against xspice known results.

Ok, should be easy to do. I already have a patch which removes the
xspice rshunt scheme. 

I guess the next step would be to add the extra option and the if
statement to the current GMIN routine and modify the xspice bit to look
for the flag.

I will do this shortly ( today or tomorrow) and send the patch.

> - Sparse library can calculate the condition number of the circuit 
>   matrix. I think that this can be printed on the stdout to see how a
>   simulation evolves. I will check but, if my memory is not failing, 
>   the condition number can be used to estimate the number of correct 
>   digits. Why not print this info too ?

I see the function in sputils.c 
I will leave this to you if that's ok.

Stefan

-- 
Stefan Jones <ste...@mu...>
Multigig Ltd