grpdelay misses nfft

[Sven Köhler]

Hi,

when invoking
   [b, a] = butter(2, 0.5);
   grpdelay(b, a);

i get the following errors:

error: `nfft' undefined near line 94 column 13
error: evaluating argument list element number 1
error: evaluating binary operator `>' near line 94, column 18
error: if: error evaluating conditional expression
error: evaluating if command near line 94, column 3
error: called from `grpdelay' in file 
`/usr/share/octave/packages/signal-1.0.8/grpdelay.m'


Something's missing (well: nfft), but why and how can i fix it?


I tried Gentoo and ubuntu. On both Linux distributions I installed the 
packages "octave" and "octave-signal". It's Octave 3.0.1 and 
octave-signal 1.0.7.

Anybody knows, what's wrong?


Regards,
   Sven