Re: [ng-spice-devel] Linux Numerical Problems


To ng-spice-devel@ieee.ing.uniroma1.it
From "Arno W. Peters" <a.w.peters@ieee.org>
Date Thu, 27 Jul 2000 22:44:55 +0200
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In-Reply-To <Pine.LNX.3.96.1000727174656.11844A-100000@ieee.ing.uniroma1.it >; from pnenzi@ieee.ing.uniroma1.it on Thu, Jul 27, 2000 at 05:47:22PM +0200
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On Thu, Jul 27, 2000 at 05:47:22PM +0200, Paolo Nenzi wrote:
> On Thu, 27 Jul 2000, Manfred Metzger wrote:
> 
> > I don't think so, because I have a spice3f5 on my Linux box at home, 
> > which gives, at least on some examples I have tried, correct results, 
> > where ngspice fails.
> 
> I am pleased to hear that. This means that our basement is solid. Good!

I have tried filt_rc.cir on ng-spice-0.0.  That gives the following
results.

============================================================
Note: can't find init file.

Circuit: RC filter

Error on line 2 : v1 1 0 0 ac 1.0
        Device type Vsource not supported by this binary
Warning: singular matrix:  check nodes 1 and 1

Note: starting Gmin stepping
Note: One successful Gmin step
Note: One successful Gmin step
Note: One successful Gmin step
Note: One successful Gmin step
Note: One successful Gmin step
Note: One successful Gmin step
Note: One successful Gmin step
Note: One successful Gmin step
Note: One successful Gmin step
Note: One successful Gmin step
Note: One successful Gmin step
Note: One successful Gmin step
Note: Gmin stepping completed
Circuit: RC filter
Date: Thu Jul 27 22:41:32  2000


 RC filter
 Pole-Zero Analysis  Thu Jul 27 22:41:32  2000
---------------------------------------------------
Index   all                             
---------------------------------------------------
0       -1.000000e+08,  0.000000e+00    

==============================================================

Note that the error comes from my desire to cut compilation time.  I
have not included the full range of devices in this executable.  This,
however, should not impact the pole-zero analysis in any way.

When time permits, I'll do a binary search on the release tarballs to
find the version that introduced the bug in the first place.


Happy hacking,
-- 
Arno

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