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[Octave-bug-tracker] [bug #44008] freqz nuance

From: Mike Miller
Subject: [Octave-bug-tracker] [bug #44008] freqz nuance
Date: Thu, 15 Jan 2015 02:12:17 +0000
User-agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.95 Safari/537.36

Update of bug #44008 (project octave):

              Item Group:                   Other => Incorrect Result       
                  Status:                    None => Need Info              


Follow-up Comment #1:

Thanks for your bug report. I believe you are simply passing the wrong input
to the freqz function. Please note that the object returned by the control
package system functions is a cell array of vectors. To get the numerator and
denominator as ordinary row vectors, use Hz.num{1} and Hz.den{1}.

And I don't know what you saw to suggest zero-padding the numerator, or what
bug report you referred to in the attached file (can you provide a link?). But
try updating your script to use the following call to freqz instead:

[fr, w] = freqz (Hz.num{1}*k, Hz.den{1}, 20);

Does this produce what you expect? Do you expect to be able to get this result
in a different way that is not working?


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