invfreqs broken?

[Schirmacher, Rolf]

Hello,

I can't get invfreqs to work properly, even when using the example code
given at
> help invfreqs

What I get for the example is:

octave.exe:17>  B = [1/2 1];
octave.exe:18>       A = [1 1];
octave.exe:19>       w = linspace(0,4,128);
octave.exe:20>       H = freqs(B,A,w);
octave.exe:21>       [Bh,Ah] = invfreqs(H,w,1,1);
error: mx_el_eq: nonconformant arguments (op1 is 0x0, op2 is 1x5)
error: evaluating binary operator `==' near line 84, column 9
error: if: error evaluating conditional expression
error: evaluating if command near line 84, column 3
error: called from `invfreq' in file
`C:\Programme\Octave\share\octave\packages\signal-1.0.2\invfreq.m'
error: called from `invfreqs' in file
`C:\Programme\Octave\share\octave\packages\signal-1.0.2\invfreqs.m'

I am running the precompiled windows binary of release 2.9.13

Thanks for any hint,

schi