Returns a vector for an optimized m x m plot grid to be
used with e.g. par(mfrow). m x m is as close as
possible to the input n. Of course, there will be empty
grid positions if n < m x m.
Usage
make.grid(n)
Arguments
n
An integer, denoting the total number of plots
to be created.
Value
A 2-element vector with the dimensions of the grid.