These three functions calculate the minimum and maximum of all numbers within a 2-dimensional cell (or numeric) matrix.
The cell matrix may contain other cell matrices, or numeric matrices, or a mix of them. The contained cell matrices may in turn contain others, etc.
The search is performed by nested calls, therefore the same applied to all levels of nesting.
This function can be of use when searching for the minimum and maximum coordinates of all graphics objects in a plot.
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