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.
Number of 1s in a binary string
Create a vector whose elements depend on the previous element
Return 'on' or 'off'
04 - Scalar Equations 2
find the mean of all elements in a matrix
multiply an array by its position number
find a specific element from an matrix
Find remainder when x is divided by 3
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