[Octave-patch-tracker] [patch #10352] adding islinphase.m

[John Donoghue]

Follow-up Comment #3, patch #10352 (project octave):

I diffed the attached grpdelay to mine and its the same, I also verified
islinphase is the same as the attached file.

Removing the ';' on the polebins  = find (abs (den) < minmag) line in grpdelay
and running I see:

> b = [1 -1]; a = [1 -2];
f = islinphase (b, a, 1E-1);
polebins = 1
warning: grpdelay: setting group delay to 0 at singularity
warning: called from
    grpdelay at line 191 column 5
    islinphase at line 94 column 9






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