[Octave-bug-tracker] [bug #42561] gnuplot colors incorrect for 'demo trimesh'

[Rik]

Follow-up Comment #12, bug #42561 (project octave):

I think this is a consequence of how Octave is trying to map to Matlab.  In
Matlab, scatter produces a Scatter Group Series object.  In Octave, we use an
hggroup that has the appropriate Scatter Group properties, but the internal
implementation is done with patch objects since each scatter object could have
a different size and/or color.  See
http://www.mathworks.com/help/matlab/ref/scatter.html and
http://www.mathworks.com/help/matlab/ref/scatterseries-properties.html.

scatter is very slow, probably as you say, because it has to create so many
objects.  The function needs an overhaul for other reasons as well as it
doesn't produce Matlab compatible results.  See bug #48873 where it is the
last function that needs work.

Overhauling scatter promises to be a significant coding effort so I don't
think it will happen before 4.2.

If there is a temporary fix for gnuplot that would be nice, otherwise it can
be addressed when scatter is re-done.

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