octave-bug-tracker
[Top][All Lists]
Advanced

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[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




    _______________________________________________________

Reply to this item at:

  <http://savannah.gnu.org/bugs/?38134>

_______________________________________________
  Message sent via/by Savannah
  http://savannah.gnu.org/




reply via email to

[Prev in Thread] Current Thread [Next in Thread]