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.
Area of an equilateral triangle
ベクトル [1 2 3 4 5 6 7 8 9 10] の作成
Matlab Basics II - squares
Remove All elements less than 5
Find remainder when x is divided by 3
Determine whether the input is divisible by 3 as well as 5
find the mean of all elements in a matrix
multiply an array by its position number
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