[Octave-bug-tracker] [bug #32741] filter initial conditions do not work for matrix input

[anonymous]

URL:
  <http://savannah.gnu.org/bugs/?32741>

                 Summary: filter initial conditions do not work for matrix
input
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Thu 10 Mar 2011 07:09:51 PM UTC
                Category: Interpreter
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: None
                  Status: None
             Assigned to: None
         Originator Name: Valentin Abramzon
        Originator Email: address@hidden
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 3.2.4
        Operating System: GNU/Linux

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Details:

When I try to use the filter function to perform IIR filtering on each column
of a matrix, specifying initial conditions produces and error:

filter( [ 1, 1 ], [ 1 ], [ 1 2; 3 4; 5 6 ], [ 1, 1 ] )
  error: filter: first dimension of si must be of length max (length (a),
length (b)) - 1

Since a = [ 1 ] and b = [ 1, 1 ], 
  max(length (a), length (b)) - 1 = 1.

The first dimension of my initial condition si = [ 1, 1 ] is 1, so it seems
that this should work, not give me an error.

I also checked the same statement in Matlab, and it produces the expected
results:

>> filter( [ 1, 1 ], [ 1 ], [ 1 2; 3 4; 5 6 ], [ 1, 1 ] )

ans =

     2     3
     4     6
     8    10

As far as I could tell, the was not fixed in Octave 3.4.0.




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