Re: [bug #68195] Incorrect Bode plots with ILL-conditioned systems

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Those 2 Bode plots are from completely different transfer functions.

starting magnitude is different
ending  phase angle is different

Uper significant frequency is different.

I can't test it now.


On Mon, 30 Mar 2026 at 09:22, Luiz Antonio Maccari Junior <
[email protected]> wrote:

> Please use the bug tracker to post updates to a bug report.  The mailing
> list is intended as a read-only notification stream.  Info posted to this
> mailing list address won't appear in the tracker database where it is most
> useful.
>
> Follow-up Comment #1, bug #68195 (group octave):
>
> If someone wants to test it on MATLAB the code is:
>
> -----------------------------
>
> clear
> clc
> close all
>
> load('octave')
>
> fields = fieldnames(So_KF);
>
> fields
>
> num1=So_KF.num{1,1}.poly
> den1=So_KF.den{1,1}.poly
>
> So_KF_tf = tf(num1,den1)
>
>
> num2=So_LQG.num{1,1}.poly
> den2=So_LQG.den{1,1}.poly
>
> So_LQG_tf = tf(num2,den2)
>
> freq=[1:10:10e4];
>
> figure
> bode(So_LQG_tf,freq)
>
> figure
> bode(So_KF_tf,freq)
>
> -----------------------------------
>
>
>
>     _______________________________________________________
>
> Reply to this item at:
>
>   <https://savannah.gnu.org/bugs/?68195>
>
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