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.
Flip the main diagonal of a matrix
Matlab Basics - Create a row vector
Finding perimeter of a rectangle
Area of a circle
Calculating selling price
find the mean of all elements in a matrix
multiply an array by its position number
Find remainder when x is divided by 3
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