find the first elements of a column matrix
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.
Select every other element of a vector
Matrix to column conversion
Sum of diagonals elements of a matrix
find a specific element from an matrix
Calculating selling price
find the mean of all elements in a matrix
modulus of a number
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