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.
Replace all zeros and NaNs in a matrix with the string 'error'
Magic is simple (for beginners)
Calculate the height of an object dropped from the sky
create a circulant matrix
Hard limit function
Input & Output "Smart One"
Find my secret function III
Find my secret function IV
Is it a mail?
Hilbert Scan Algorithm
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