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.
Generate a NaN...on purpose
Number of digits in an integer
find the roots of a quadratic equation
Matlab Basics - Convert a row vector to a column vector
Divide by 4
find a specific element from an matrix
multiply an array by its position number
Find remainder when x is divided by 3
modulus of a number
find the mean of all elements in a matrix
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