Create the convolution-power vector from initial vector x and power n. In other words, similar to the scalar case, raising to the n-th power means repeating the convolution on itself n times.
Assume that n is a non-negative integer and x is a row vector.
convpower(1:5,0) ans = 1
convpower(1:5,1) ans = 1 2 3 4 5
convpower(1:5,2) ans = 1 4 10 20 35 44 46 40 25
Neither string operations nor interpolations are allowed!
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