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] -> 
radius of a spherical planet
Vectorize the digits of an Integer
Add offset to a signal
Find files with extension ext in the current directory
Find Missing Number
Two functions (to be sure)
Rank of magic square (for beginners)
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