Replicate each element of a row vector (with NaN) a constant number of times.
n=2, A=[1 2 3] -> [1 1 2 2 3 3]
n=0, A=[2 1] -> 
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Who is the smartest MATLAB programmer?
Simple equation: Annual salary
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Decrypt the cypher using XOR encryption (for beginners)
Generalised Hamming Number
Longest Collatz Sequence
Negation and new variables
Numbers spiral diagonals (Part 1)
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