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
Find the sum of the elements in the "second" diagonal
Back to basics 14 - Keywords
Matrix indexing with two vectors of indices
Generate a random matrix A of (1,-1)
Create a two dimensional zero matrix
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