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.
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Symmetry of vector
02 - Vector Variables 1
Matlab Basics - Set unwanted parts of a vector to zero
Find remainder when x is divided by 3
modulus of a number
find a specific element from an matrix
multiply an array by its position number
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