Can you explain why is the same matrix c = [0 -1; 0 0 ; 1 0] used to represent two different polynomials p(x,y) = x-y^2 (as in problem definition above) and p(x,y) = y - x^2 as in test example 3 on the solution page?
Sum the entries of each column of a matrix which satisfy a logical condition.
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