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

[Mike Miller]

Update of bug #56851 (project octave):

                  Status:                    None => Need Info              

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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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