How to find global extremum?

[Witold Interewicz]

Hello,
I have 2D in space +1D in time (or better 3D in space + 1D in time) field, and I
need to find global extrema of these fields. The result is needed in the form of
number assigned to variable so that one could use it in code further in the
script. How one could do that?
(I didn't manage to use 'min' and 'max' functions. How to nest them properly?
Should one use 'while' loop to iterate through remaining 1 or 2 dimensions?)
Greetings
Witek

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