find the first elements of a column matrix
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.
sum of non-primes
Determine the number of odd integers in a vector
Duplicate a character
Create sequnce 1 4 9 16 25.........
modulus of a number
Find remainder when x is divided by 3
Find the last digit
Determine whether the input is divisible by 3 as well as 5
find the mean of all elements in a matrix
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