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.
Sums with Excluded Digits
Test for balanced parentheses
Project Euler: Problem 4, Palindromic numbers
Hilbert Scan Algorithm
Even or Odd
Find my secret function I
Who have the chance?
Find my secret function IV
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