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 the numbers on the main diagonal
Find the index of the largest value in any vector X=[4,3,4,5,9,12,0,4.....5]
Swap two numbers
Sum of the Matrix Elements
Determine whether the input is divisible by 3 as well as 5
modulus of a number
Find remainder when x is divided by 3
find a specific element from an matrix
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