[Octave-bug-tracker] [bug #35334] "filter" command does not accept "SI" argument

[anonymous]

URL:
  <http://savannah.gnu.org/bugs/?35334>

                 Summary: "filter" command does not accept "SI" argument
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Fri 20 Jan 2012 04:30:12 AM UTC
                Category: Libraries
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Other
                  Status: None
             Assigned to: None
         Originator Name: Peter Adamczyk
        Originator Email: address@hidden
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 3.4.3
        Operating System: Microsoft Windows

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Details:

Hi Octave,

I was trying to use "filtfilt" to do two-way filtering, and it I kept getting
an error from "filter", which is called from within. 

I tried again with "filter" directly, and it seems to fail whenever one
includes an "SI" argument (4th argument). This appears to be a problem with
the internal code. See below for session output. 



octave:11> b = randn(100,1)+sin((1:100)'/6);
octave:12> B = ones(1,5);
octave:13> A = 5;
octave:14> b2 = filtfilt(B,A,b);
error: filter: first dimension of SI must be of length max (length (a), length
(b)) - 1
error: called from:
error:  
C:\Octave\Octave3.4.3_gcc4.5.2\Octave3.4.3_gcc4.5.2\share\octave\packages\signal-1.0.11\filtfilt.m
at line 85, column 3
octave:14> b3 = filter(B,A,b,[1 1 1 1]);
error: filter: first dimension of SI must be of length max (length (a), length
(b)) - 1
octave:14>




Thanks, 
-Peter




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