Re: [ng-spice-devel] Pole-zero analysis issues.
On Fri, 16 Jun 2000, Arno W. Peters wrote:
> On Fri, Jun 16, 2000 at 06:30:44PM +0200, Paolo Nenzi wrote:
> So far I haven't compiled any of the older versions to see what
> version introduced the error. If somebody would step up to check
> this?
I have compiled the cktpx* code with PZDEBUG defined and run the
simulation with the bridge filter:
Circuit: * Bridge T Filter
ngspice 1 -> run
suggestion(0/0/4 | 0): init
Guess
* ( 1/ 1) 0 0 :: 0.524287999999998977074255890329 0 -19
suggestion(1/0/4 | 0): init
Guess
* ( 2/ 2) 1 0 :: 0.525861388287999220736423922062 0 -19
suggestion(1/0/4 | 0): init
given 1 0 / 0 0 / 1 0
suggestion(1/0/4 | 3): sym 1
* ( 3/ 3) nan 0 :: nan nan -2147483648
given 0 0 / 1 0 / nan 0
suggestion(1/0/4 | 3): sym 1
* ( 4/ 4) nan 0 :: nan nan -2147483648
given 1 0 / nan 0 / nan 0
suggestion(1/0/4 | 3): sym 1
* ( 5/ 5) nan 0 :: nan nan -2147483648
given nan 0 / nan 0 / nan 0
suggestion(1/0/4 | 3): split right
* ( 6/ 6) nan 0 :: nan nan -2147483648
Aborted
There are a lot of NANs, do not seems normal. The other circuit (the
filt_rc.cir) ends in a segmentation violation (the output is attached
below)
filt_rc.out:
suggestion(0/0/3 | 0): init
Guess
* ( 1/ 1) 0 0 :: 0.511999999999999566568931186339 0 -9
suggestion(1/0/3 | 0): init
Guess
* ( 2/ 2) 1 0 :: 0.512000005119999546110420851619 0 -9
suggestion(1/0/3 | 0): init
given 1 0 / 0 0 / 1 0
suggestion(1/0/3 | 0): skip left
Guess
* ( 3/ 3) -1 0 :: 0.511999994879999476005139058543 0 -9
given -1 0 / 0 0 / 1 0
suggestion(1/0/3 | 0): skip left
Guess
* ( 4/ 4) -10 0 :: 0.511999948799999438087127145991 0 -9
given -10 0 / 0 0 / 1 0
suggestion(1/0/3 | 0): skip right
given -10 0 / 0 0 / 0 0
suggestion(1/0/3 | 0): skip right
Guess
* ( 5/ 5) 10 0 :: 0.512000051199999584028432764171 0 -9
given -10 0 / 0 0 / 10 0
suggestion(1/0/3 | 0): skip left
given 10 0 / 0 0 / 10 0
suggestion(1/0/3 | 0): skip left
Guess
* ( 6/ 6) -100 0 :: 0.511999487999999391973915408016 0 -9
given -100 0 / 0 0 / 10 0
suggestion(1/0/3 | 0): skip right
given -100 0 / 0 0 / -10 0
suggestion(1/0/3 | 0): skip right
given -100 0 / 0 0 / -1 0
suggestion(1/0/3 | 0): skip right
given -100 0 / 0 0 / 1 0
suggestion(1/0/3 | 0): skip right
given -100 0 / 0 0 / 0 0
suggestion(1/0/3 | 0): skip right
Guess
* ( 7/ 7) 100 0 :: 0.51200051199999951911934203963 0 -9
given -100 0 / 0 0 / 100 0
suggestion(1/0/3 | 0): skip left
given 100 0 / 0 0 / 100 0
suggestion(1/0/3 | 0): skip left
Guess
* ( 8/ 8) -1000 0 :: 0.511994879999999374931007878331 0 -9
given -1000 0 / 0 0 / 100 0
suggestion(1/0/3 | 0): skip right
given -1000 0 / 0 0 / -100 0
suggestion(1/0/3 | 0): skip right
given -1000 0 / 0 0 / 10 0
suggestion(1/0/3 | 0): skip right
given -1000 0 / 0 0 / -10 0
suggestion(1/0/3 | 0): skip right
given -1000 0 / 0 0 / -1 0
suggestion(1/0/3 | 0): skip right
given -1000 0 / 0 0 / 1 0
suggestion(1/0/3 | 0): skip right
given -1000 0 / 0 0 / 0 0
suggestion(1/0/3 | 0): skip right
Guess
* ( 9/ 9) 1000 0 :: 0.512005119999999647184552031831 0 -9
given -1000 0 / 0 0 / 1000 0
suggestion(1/0/3 | 0): skip left
given 1000 0 / 0 0 / 1000 0
suggestion(1/0/3 | 0): skip left
Guess
* ( 10/ 10) -10000 0 :: 0.511948799999999315524235043995 0 -9
given -10000 0 / 0 0 / 1000 0
suggestion(1/0/3 | 0): skip right
given -10000 0 / 0 0 / -1000 0
suggestion(1/0/3 | 0): skip right
given -10000 0 / 0 0 / 100 0
suggestion(1/0/3 | 0): skip right
given -10000 0 / 0 0 / -100 0
suggestion(1/0/3 | 0): skip right
given -10000 0 / 0 0 / 10 0
suggestion(1/0/3 | 0): skip right
given -10000 0 / 0 0 / -10 0
suggestion(1/0/3 | 0): skip right
given -10000 0 / 0 0 / -1 0
suggestion(1/0/3 | 0): skip right
given -10000 0 / 0 0 / 1 0
suggestion(1/0/3 | 0): skip right
given -10000 0 / 0 0 / 0 0
suggestion(1/0/3 | 0): skip right
Guess
* ( 11/ 11) 10000 0 :: 0.512051199999999595569022403652 0 -9
given -10000 0 / 0 0 / 10000 0
suggestion(1/0/3 | 0): skip left
given 10000 0 / 0 0 / 10000 0
suggestion(1/0/3 | 0): skip left
Guess
* ( 12/ 12) -100000 0 :: 0.511487999999999387590321475727 0 -9
given -100000 0 / 0 0 / 10000 0
suggestion(1/0/3 | 0): shift left
Guess
* ( 13/ 13) -1000000 0 :: 0.506879999999999442117371017957 0 -9
given -1000000 0 / -100000 0 / 0 0
suggestion(1/0/3 | 0): shift left
Guess
* ( 14/ 14) -10000000 0 :: 0.92159999999999886455270825536 0 -10
given -10000000 0 / -1000000 0 / -100000 0
suggestion(1/0/3 | 0): shift left
Guess
* ( 15/ 15) -100000000 0 :: -0.749999999999995781152506424405 0 -60
given -100000000 0 / -10000000 0 / -1000000 0
suggestion(1/0/3 | 1): sym 2
diff_frac.real = -5.96046e-08, p->s = -1e+08, nt = -1e+08
ab=1e-20,rel=1e-12
ALTER from: -99999999.9999999403953552246094 0
nt->next -1e+08
nt->next -1e+06
not 2
p1 -1.1e+08
take p1
ALTER to : -55000000 0
* ( 16/ 16) -55000000 0 :: 0.921599999999998198418893480266 0 -11
given -100000000 0 / -55000000 0 / -10000000 0
suggestion(1/0/3 | 1): sym 2
diff_frac.real = -5.96046e-08, p->s = -1e+08, nt = -1e+08
ab=1e-20,rel=1e-12
ALTER from: -99999999.9999999403953552246094 0
internal error -- segmentation violation
Paolo
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