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[Octave-bug-tracker] [bug #43263] Minreal (control toolbox) may generate
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From: |
Endre Kozma |
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Subject: |
[Octave-bug-tracker] [bug #43263] Minreal (control toolbox) may generate inaccurate result |
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Date: |
Mon, 22 Sep 2014 12:01:03 +0000 |
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User-agent: |
Mozilla/5.0 (Windows NT 6.1; WOW64; rv:24.0) Gecko/20100101 Firefox/24.0; Mozilla Firefox 24.7.0 - 10652-10110-57 |
Follow-up Comment #1, bug #43263 (project octave):
I guess the problem is near to singularity somewhere. Scilab signals this at
least.
I changed the code a bit at calculation of Gff. Thus the resulting plot looks
as expected.
s=tf('s');
Gpff = 3/((1+4*s)*(1+6*s));
Gcc = (1+1/(60*s));
Glff = feedback(series(Gcc, Gpff));
## Gff = minreal(Glff);
Gff = ss(minreal(Glff));
Gplc = 0.001111*(1-30*s)/(s*(1+30*s));
Gplc = series(Gplc, Gff);
Gclc = (1+1/(2.5*60*s))*(0.2*60*s+1)/((1+6*s)*(1+1.2*s));
Gllc = minreal(series(Gclc,Gplc));
Gllc_cl = minreal(feedback(Gllc));
step(Gllc_cl);
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