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] -> 
Reindex a vector
Reverse a matrix
Make a half wave rectifier
Find the nearest prime number
Permute diagonal and antidiagonal
Numbers spiral diagonals (Part 2)
Numbers spiral diagonals (Part 1)
Expression or variable?
Decrypt the cypher using XOR encryption (for beginners)
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