[Octave-bug-tracker] [bug #40663] scatter and scatter3 terribly slow with real-valued color vector

[Mike Miller]

Update of bug #40663 (project octave):

                  Status:               Need Info => Confirmed              
                 Summary: statter and scatter3 terribly slow => scatter and
scatter3 terribly slow with real-valued color vector

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Follow-up Comment #4:

Ok, I see slow performance with this example, definitely due to the presence
of the 4th argument.

These three uses do not appear to me to be any different in performance:


octave:1> a = randn (1e4, 2);
octave:2> scatter (a(:,1), a(:,2));
octave:3> c = randi (64, 1e4, 1);
octave:4> scatter (a(:,1), a(:,2), [], c);
octave:5> c = fix(randn (1e4, 1));
octave:6> scatter (a(:,1), a(:,2), [], c);


but the following usage is extremely slow (I haven't waited long enough to let
it finish yet)


octave:7> c = randn (1e4, 1);
octave:8> scatter (a(:,1), a(:,2), [], c);


It's not clear to me from the help for scatter what the expected behavior is
when the color argument is a vector with the same length as X but consists of
non-integral values instead of integer-valued indices.

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