[Octave-bug-tracker] [bug #60677] [octave forge] (control) add functionality to tf class

[Torsten Lilge]

Follow-up Comment #4, bug #60677 (project octave):

abs (H) and angle (H) does not work in Matlab if H is really a tf object.

>From the document of your link, I don't think that H is really a tf object.
Instead, on page 215, H is defined as


H = freqs(num,den,w);


which is not a transfer function but the frequency response of a transfer
function with numerator num and denominator den. If you have a transfer
function H of a SISO system, then you have to do the following:


[num,den] = tfdata (H);
w = logspace (-2, 2, 500)  % or whatever is suitable for your system
Hw = freqs (num{1}, den{1});
mag = abs (Hw);
phase = angle (Hw);


If you can confirm that this code works for you, I will close this report.



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