[Octave-bug-tracker] [bug #53019] [octave forge] (signal) zplane plotting enhancements

[Mike Miller]

Follow-up Comment #5, bug #53019 (project octave):

I would like to know from someone who does have access to Matlab whether
zplane actually respects the axes 'ColorOrder' and 'ColorOrderIndex'
properties.

Does the following in Matlab


z = 0.9 * exp (1j * pi * [.25 -.25]).';
p = 0.98 * exp (1j * pi * [0.2 -0.2 0.4 -0.4]).';
plot (1:10);
hold on;
get (gca, 'ColorOrderIndex')
zplane (z, p);
get (gca, 'ColorOrderIndex')


return 2 and 3 respectively? And are the poles, zeros, and unit circle plotted
in an orange color instead of the default blue color?

If I get a positive confirmation that zplane should use and increment the
color order index, then I will be happy to integrate those changes in.

The problem with the change to query the current axis limits is that it
doesn't depend on whether 'hold' is on or off.

I think a better approach might be to plot the zeros, poles, and unit circle,
respecting whether 'hold' is on or off, and then adjust the limits if needed.

The change to include the multiplicity of zeros and poles looks good and does
seem to be Matlab compatible since it is mentioned in the docs.

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