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[Octave-bug-tracker] [bug #56851] [octave forge] (signal) butter returns

From: Mike Miller
Subject: [Octave-bug-tracker] [bug #56851] [octave forge] (signal) butter returns incorrect value
Date: Mon, 9 Sep 2019 16:49:06 -0400 (EDT)
User-agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/76.0.3809.132 Safari/537.36

Update of bug #56851 (project octave):

                  Status:                    None => Need Info              


Follow-up Comment #8:

We can show that it's not an error for the butter function to return filter
coefficients that aren't practically useful when the filter spec is
unreasonable. IOW, garbage in == garbage out.

For compatibility with Matlab, the butter function should not enforce some
kind of constraints on the input or output and report an error, it should just
return what it can compute.

Can you show specifically what gives you a division by zero? Not the 'filter'
function and not the 'freqz' function. Maybe some other function can report an
improved error message in this case?


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