[OctDev] pwelch bugs

[Dmitri A. S. <das...@gm...>]

The new version of pwelch (by  Peter V. Lanspeary) seems to have problem
parsing argument list. E.g. "demo pwelch" would fail:

pwelch example 1: failed
error: pwelch: arg 3 (overlap) must be real from 0 to 0.950000

apparently on the line pwelch(x,[],[],[],[],0.9);

It also gets easily confused when pwelch called with two channels, e.g.:

pwelch(x, y, [], [], [], 1000, [], [], "mean", [], "trans")
error: pwelch: can give confidence interval for x power spectrum only
error: evaluating if command near line 507, column 3
error: evaluating if command near line 279, column 1
error: called from `pwelch' in file
`/usr/share/octave/site/m/octave-forge/signal/pwelch.m'

In fact it appears that i cannot specify any parameter between
"sampling frequency" and "result" parameters...

Sorry, I do not have a patch, the source of pwelch.m is too
unwieldy for me.

Sincerely,

Dmitri.
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