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[Octave-bug-tracker] [bug #38134] signal package: bug in remez
From: |
Carnë Draug |
Subject: |
[Octave-bug-tracker] [bug #38134] signal package: bug in remez |
Date: |
Mon, 21 Jan 2013 15:22:31 +0000 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:10.0.12) Gecko/20100101 Firefox/10.0.12 Iceweasel/10.0.12 |
URL:
<http://savannah.gnu.org/bugs/?38134>
Summary: signal package: bug in remez
Project: GNU Octave
Submitted by: carandraug
Submitted on: Mon 21 Jan 2013 03:22:30 PM GMT
Category: Octave Forge Package
Severity: 3 - Normal
Priority: 5 - Normal
Item Group: Incorrect Result
Status: None
Assigned to: None
Originator Name:
Originator Email:
Open/Closed: Open
Discussion Lock: Any
Release: dev
Operating System: Microsoft Windows
_______________________________________________________
Details:
The following was reported on the mailing list on 15/01/2012 by Anders Brandt.
nabble thread
<http://octave.1599824.n4.nabble.com/Suspected-bug-in-remez-command-td4633970.html>.
----
I am experiencing problems with the remez command in Octave 3.2.4 on Windows.
I have tried a number of different orders and griddensities, but all seem to
give error. I am trying to define a differentiator.
Example:
B=remez(4,[0 0.8],[0 0.8]*pi,'differentiator',4*1024) gives me coefficients
-0.02488 0.35098 -1.00103 0.00000 ... (neg. symmetry)
MATLAB's firpm, which I understand should give the same (similar) output,
gives
B= 0.1519 -0.4161 0.9424 0
The MATLAB result is a really decent differentiator, which cannot be said
about the remez output.
----
Robert T. Short commented:
I don't think this function works. I have not tried it in a long time, but I
never got any useful results. I played around with it enough to believe it
would not be hard to fix, but it has never bubbled up the priority stack
enough to actually do it.
Bob
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