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] -> 
Remove the vowels
Most nonzero elements in row
Test for balanced parentheses
Back to basics 7 - Equal NaNs
Create a two dimensional zero matrix
Return a list sorted by number of consecutive occurrences
Find files with extension ext in the current directory
Numbers spiral diagonals
Mysterious digits operation (easy)
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