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.
Switch matrix to a column vector
Side of a rhombus
Sum of series V
UICBioE240 problem 1.6
Find remainder when x is divided by 3
find the mean of all elements in a matrix
Find the last digit
multiply an array by its position number
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