scale algorithm

Hi,

I'm embarking on a task where I need an algorithm to do
something similar to how the scales on axes are set
automatically, or (more similarly) to how round numbers are
automatically selected for the contour values in contour
plots.

It's kind of a complicated problem, actually. Given a 3-d
surface and a specified range in the X-Y plane, figure out
good contour values to use (without relying on the
automatic feature). I can gin up my own algorithm, I
suppose, but was curious if anyone knew how Matlab does it,
or if they have any other suggestions for where to start.

Thanks,
Tom
.

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