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.
Compute a dot product of two vectors x and y
Duplicate each element of a vector.
Replace multiples of 5 with NaN
Sum of series III
Square a Number
find a specific element from an matrix
Find the last digit
Calculating selling price
Find remainder when x is divided by 3
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