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.
Remove all the consonants
Generate a vector like 1,2,2,3,3,3,4,4,4,4
Evaluating a polynomial
Finding perimeter of a rectangle
find the mean of all elements in a matrix
Calculating selling price
multiply an array by its position number
modulus of a number
Find remainder when x is divided by 3
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