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[Octave-bug-tracker] [bug #45232] [octave forge] (signal) spectrogram fu

From: Chris Gorman
Subject: [Octave-bug-tracker] [bug #45232] [octave forge] (signal) spectrogram function to replace legacy specgram function
Date: Sat, 9 Nov 2019 11:28:53 -0500 (EST)
User-agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/78.0.3904.70 Chrome/78.0.3904.70 Safari/537.36

Follow-up Comment #4, bug #45232 (project octave):

Hi John (and Mike),

Just trying out the spectrogram function you wrote.  (Thanks for all the hard
work.)  I would like to comment on it.

First off running `help spectrogram` gets the following errors for me.

octave:26> help spectrogram
/tmp/octave-help-Wnvppb:125: misplaced }
/tmp/octave-help-Wnvppb:170: table requires an argument: the formatter for
/tmp/octave-help-Wnvppb:187: superfluous argument to @end ifinfo: . (possibly
involving @seealso)
/tmp/octave-help-Wnvppb:196: table requires an argument: the formatter for
/tmp/octave-help-Wnvppb:199: table requires an argument: the formatter for
/tmp/octave-help-Wnvppb:199: no matching `@end table'
/tmp/octave-help-Wnvppb:199: bad argument to @end: @table
/tmp/octave-help-Wnvppb:268: `@end' expected `table', but saw `deftypefn'

Are there some installation instructions I need to follow?  All I did was copy
the function to the current working directory and tried to run it.  After the
errors, the function description follows.

Next, running without setting the command equal to a variable fails to
generate a plot for me.   I tried the first example at
https://www.mathworks.com/help/signal/ref/spectrogram.html and I get the

octave:27> N = 1024;
octave:28> n = 0:N-1;
octave:29> w0 = 2*pi/5;
octave:30> x = sin(w0*n)+10*sin(2*w0*n);
octave:31> s = spectrogram(x);
octave:32> spectrogram(x,'yaxis')
error: pwelch: string arg 6 illegal value: psd
error: called from
    pwelch at line 442 column 11
    spectrogram at line 235 column 19

How do I generate a plot of the data? 

I can try out patches, or new versions if you like.  But next week I am busy,
so expect some delays in my response times.  Again thanks for all the hard
work you've put into octave and thanks in advance for instructions on how to
use spectrogram.


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