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[Octave-bug-tracker] [bug #53205] buttord function MATLAB compatibility

From: Botond Sandor Kirei
Subject: [Octave-bug-tracker] [bug #53205] buttord function MATLAB compatibility issue
Date: Thu, 22 Feb 2018 08:17:18 -0500 (EST)
User-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.167 Safari/537.36


                 Summary: buttord function MATLAB compatibility issue
                 Project: GNU Octave
            Submitted by: botondkirei
            Submitted on: Thu 22 Feb 2018 01:17:16 PM UTC
                Category: Octave Function
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Matlab Compatibility
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 4.2.1
        Operating System: Any



The MATALB function "buttord" is suitable to obtain the order of an analogic
filter too. The common use for analog filter design is "buttord(...,'s')" - 
the 's' flag is appended in the argument list.

The current versions of Siganl package of OCTAVE is not compliant with the
MATLAB function.

Proposed solution:

I am not sure how to contribute to octave's signal package codebase, thus I
created a development branch:

The proposed implementation is in the branches buttord.m function.


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