I'd suggest adding test cases in which n (or abs(n)) is larger than the dimension of x; for example, x is a 4-by-4 matrix and n = 6.
smooth~ basically same idea, my solution however is bit of inflexible.
Will work also for non-square input matrix x.
Swap the input arguments
How long is the longest prime diagonal?
Get the elements of diagonal and antidiagonal for any m-by-n matrix
Find my secret function III
Hilbert Scan Algorithm
Find my secret function IV
Is it a mail?
Divisible by 21
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