In the help of the the filtfilt function there is this sequence:

    [b, a]=butter(3, 0.1);                   % 10 Hz low-pass filter
    t = 0:0.01:1.0;                         % 1 second sample
    x=sin(2*pi*t*2.3)+0.25*randn(size(t));  % 2.3 Hz sinusoid+noise
    y = filtfilt(b,a,x); z = filter(b,a,x); % apply filter

The last line leads to the following error:

error: filter: first dimension of SI must be of length max (length (a),
length (b)) - 1
error: called from:
error:  
/usr/local/octave-3.5/share/octave/packages/signal-1.0.11/filtfilt.m at line
85, column 3

The error is not in octave-3.4.

M.

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