Re: [Help-gnucap] Bizarre behaviour -- possibly a bug.
Felix Salfelder <[email protected]>
| Newsgroups | gmane.comp.gnu.gnucap.devel |
|---|---|
| Message-ID | <[email protected]> |
On Sun, May 26, 2013 at 04:05:16AM -0400, al davis wrote:
> Spice avoids the problem by not printing anything for time=0
> when you do UIC. Gnucap plainly shows that UIC is screwed up,
> as it implements bug-for-bug compatibility.
spice-compatibility is fine, but spice sucks. how about extending the dc
and tran commands a bit? in gnucap-uf, i have implemented an "uic"
switch for dc and a "cont" switch for tran. so this works:
spice
V1 m1 0 3
R1 m1 m2 50
C3 m2 0 4u ic=0.5
* V1 __R3 C3
* o---O--[__]--||---o
* | |
* V V
.print dc v(nodes)
.print TRAN v(nodes) conv(C3)
* change C3 into a voltage source and compute OP
.dc uic
* do a transient starting from that OP
.TRAN 0 200u 10u cont
.end
if you like, you can port this to upstream. lets see if it can be done
without breaking other things (i'm pretty sure). the changes to
s_{dc,tran} can start as plugins in opt. changes to d_cap and backend
need more thought...
regards
felix