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.
Find the logic
Matlab Basics - Rounding I
Matrix of almost all zeros, except for main diagonal
find a specific element from an matrix
multiply an array by its position number
Find the last digit
modulus of a number
Find remainder when x is divided by 3
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