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.
Swap the first and last columns
Back to basics 23 - Triangular matrix
Return elements unique to either input
Arrange vector in ascending order
Change string to number
modulus of a number
find the mean of all elements in a matrix
find a specific element from an matrix
Find the last digit
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