bugGNU Octave - Bugs: bug #38134, signal package: bug in remez


bug #38134: signal package: bug in remez

Submitted by:  CarnĂ« Draug <carandraug>
Submitted on:  Mon Jan 21 15:22:30 2013  
Category: Octave Forge PackageSeverity: 3 - Normal
Priority: 5 - NormalItem Group: Incorrect Result
Status: ConfirmedAssigned to: None
Originator Name: Open/Closed: Open
Release: devOperating System: Any

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Fri Jun 21 03:37:59 2013, comment #1:

Confirmed that the remez() function does give poor results for the given example, although I don't see exactly the same coefficients as reported.

Mike Miller <mtmiller>
Project Administrator
Mon Jan 21 15:22:30 2013, original submission:

The following was reported on the mailing list on 15/01/2012 by Anders Brandt. nabble thread.

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.


MATLAB's firpm, which I understand should give the same (similar) output, gives

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.


Carnë Draug <carandraug>
Project Member


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Attach File(s):

Attached Files
file #32732:  Bug38134.patch added by laurentg (14kB - application/octet-stream - See Bug38134.patch for a fix attempt (including tests against other sources I could find))


Depends on the following items: None found

Items that depend on this one: None found


Carbon-Copy List
  • -unavailable- added by laurentg (Updated the item)
  • -unavailable- added by mtmiller (Posted a comment)
  • -unavailable- added by carandraug (original bug reporter)

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    Follow 5 latest changes.

    Date Changed By Updated Field Previous Value => Replaced By
    Tue Dec 30 01:51:07 2014carandraugCarbon-CopyRemoved 79703=>-
    Tue Dec 30 01:49:36 2014laurentgAttached File-=>Added Bug38134.patch, #32732
    Fri Jun 21 03:37:59 2013mtmillerStatusNone=>Confirmed
      Operating SystemMicrosoft Windows=>Any
    Mon Jan 21 15:22:30 2013carandraugCarbon-Copy-=>Added -unavailable-

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