[Octave-bug-tracker] [bug #37458] cont_lev undefined in contourf

[Mark H.]

Follow-up Comment #5, bug #37458 (project octave):

Yes, I now see the problem with the contourf call. I also see that the
original issue was about the error message being unhelpful, not that the
example code fails to generate a plot.

So, this issue is that the error message is misleading as to where the problem
is. It looks like an Octave bug due to a variable not being set. The actual
problem is that the user's command will result in no contours being drawn.
Adding the lines from the original patch will get rid of the error message, so
the user will examine their own code first. Perhaps adding a warning would
also help the user diagnose this case.

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