Given the vectors x and y as input, multiply the vectors and return the summation of its elements.
x = [1 2 3 4];
y = [4 3 2 1];
x * y = [4 6 6 4];
z = 4 + 6 + 6 + 4 = 20
Back to basics 1 - Saving
Sum of diagonal of a square matrix
Getting logical indexes
Output any real number that is neither positive nor negative
Length of the hypotenuse
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