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.
Return elements unique to either input
Generate a NaN...on purpose
Returning a "greater than" vector
Replace values under a limit
find a specific element from an matrix
modulus of a number
find the mean of all elements in a matrix
Find the last digit
Determine whether the input is divisible by 3 as well as 5
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