Hi,
I am trying to create a filter, N_order = 8000, and cutoff frequency 0.01.
Thus I type: b = fir1(8000, 0.01).
However, the error message is " error: fir2 : grid size must be greater than half the filter order".
In this case, I read from
http://octave-matcompat.sourcearchive.com/documentation/20010225-7/fir1_8m-source.html
that it uses fir2 instead of fir1 by default, since the window is not specified.
However, what does "grid size" mean, and how should I overcome this?
I am using octave UPM R8.1
Thanks,
matt