n is a nonnegative interger.may it be the largest problem that i meet.
My initial solution with repelem(str,n) for n=0 creates a size 1x0 char class but suite only allows for a 0x0 class. Not sure why the difference would matter.
Back and Forth Rows
Find the sum of the elements in the "second" diagonal
Getting the indices from a matrice
Remove entire row and column in the matrix containing the input values
Moving average (variable kernel length)
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