[Octave-bug-tracker] [bug #31305] slow contour plot

[Ben Abbott]

Follow-up Comment #23, bug #31305 (project octave):

After further experimenting, what I found is that changing facecolor from
"flat" to [1, 1, 1] produces an image for contour(rand(20)) that looks
correct.

However, this never works twice in a row.

>> clear all
>> contour (rand (20))

produces the an image that looks correct

>> clear all
>> contour (rand (20))
>> contour (rand (20))

The second plot is not blank

>> clear all
>> contour (rand (20))
>> clear all
>> contour (rand (20))

The second plot looks correct.

I'll do some more tests.

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