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] -> 
Which doors are open?
Who knows the last digit of pi?
Determine Whether an array is empty
Getting logical indexes
Is this triangle right-angled?
Numbers spiral diagonals
Mysterious digits operation (easy)
Add more zeros
BLOCK x3 (Version 1)
Narcissistic number ?
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