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.
First non-zero element in each column
Rosenbrock's Banana Function and its derivatives
Calculate Euler's phi function
Volume of a sphere given its surface area
Find the minimal value in N*N Matrix
Find my secret function II
Find my secret function III
Find my secret function I
Input & Output "Smart One"
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