[Octave-bug-tracker] [bug #36449] octave function filter() does not take an initial state

[Jussi Lehtola]

URL:
  <http://savannah.gnu.org/bugs/?36449>

                 Summary: octave function filter() does not take an initial
state
                 Project: GNU Octave
            Submitted by: jussilehtola
            Submitted on: Fri 11 May 2012 08:44:16 AM GMT
                Category: None
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: None
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 3.6.1
        Operating System: GNU/Linux

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Details:

Fedora bug #820791
https://bugzilla.redhat.com/show_bug.cgi?id=820791

Description of problem:
filter() function does not accept an initial state

Version-Release number of selected component (if applicable):
octave-3.4.3-1.fc16.x86_64

How reproducible:
every time

Steps to Reproduce:
1. run octave
2. in octave:
octave:3> a=1;
octave:4> b=ones(5,1)/5;
octave:5> [x IS] = filter(b,a,[1;zeros(10,1)],[])
octave:6> IS  
IS =

   0
   0
   0
   0
octave:7> [x IS] = filter(b,a,[1;zeros(10,1)],IS);  
error: filter: first dimension of SI must be of length max (length (a),
length
(b)) - 1

but
octave:7> max (length (a), length (b)) - 1  
ans =  4

???

Expected results:

IS is the returned filter state and is the correct dimensions, but is not
accepted as an input parameter





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