Create an n-by-n magic square.
A magic square is an arrangement of the integers 1:n^2
such that the
row sums, column sums, and diagonal sums are all equal to the same value.
Note: n must be a scalar greater than or equal to 3. If you supply n less than 3, magic returns either a nonmagic square, or else the degenerate magic squares 1 and [].
Package: octave