Here is a simple contour-interval example that I don't understand. [We are changing out some uses of shade in older code when I came across something I simplified to this.]
Consider the following simple program.
(require plot)
(plot (contour-intervals
(lambda (x y)
(define z (- x y))
(cond ((< z -1) -1)
((> z 1) 1)
(else z)))
-2 2 -2 2))
Whose output is attached.
Why is the lower white triangle not colored red - they definitely have
a value of 1? It's like those points are completely ignored.
Doug
<<attachment: untitled.png>>
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