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[Octave-bug-tracker] [bug #53855] [octave forge] (signal) butter band pa

From: Dmitri A. Sergatskov
Subject: [Octave-bug-tracker] [bug #53855] [octave forge] (signal) butter band pass filter with higher order has strange pass band
Date: Tue, 8 May 2018 12:04:13 -0400 (EDT)
User-agent: Mozilla/5.0 (X11; Fedora; Linux x86_64; rv:59.0) Gecko/20100101 Firefox/59.0 
Follow-up Comment #3, bug #53855 (project octave):

Is not this the numerical instability as described in:


https://www.mathworks.com/help/signal/ref/butter.html

<<<
In general, use the [z,p,k] syntax to design IIR filters. To analyze or
implement your filter, you can then use the [z,p,k] output with zp2sos
>>>

Dmitri.
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