File: pow2-2.m

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x = [3, 0, -3, 4, 0, -4, 5, 0, -5];
y = [-2, -2, -2, 1, 1, 1, 3, 3, 3];
z = x .* (2 .^ y);
all (abs (pow2 (x,y) - z) < sqrt (eps))