File: hess-1.m

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octave 2.0.16-2
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a = [1, 2, 3; 5, 4, 6; 8, 7, 9];
[p, h] = hess (a);
size (p) == [3, 3] && size (h) == [3, 3] && abs (a - p * h * p') < sqrt (eps)