This would be better as "find the nth element of an array." Also, a column matrix doesn't exist. Perhaps you meant column vector, though the variables in your test cases are row vectors.
Most nonzero elements in row
Swap the input arguments
Equal to their cube
Concatenate two strings
Find the last digit
find the mean of all elements in a matrix
Determine whether the input is divisible by 3 as well as 5
Find remainder when x is divided by 3
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