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.
The Hitchhiker's Guide to MATLAB
Set the array elements whose value is 13 to 0
Cell Counting: How Many Draws?
Magic is simple (for beginners)
Find remainder when x is divided by 3
multiply an array by its position number
modulus of a number
find the mean of all elements in a matrix
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