'a' is a vector that starts at the origin and ends at (x, y). Find |a|.
Hint: It is as simple as "ABC".
More test cases, please! ;-)
Find the numeric mean of the prime numbers in a matrix.
middleAsColumn: Return all but first and last element as a column vector
Output any real number that is neither positive nor negative
frame of the matrix
Multiply by 3
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