function H=test(x)
% Gradient of Himmelblau, 1972
% x0 = [8, 9]'
% Xo = [5, 6]'
% S(xo) = 0

%G(1)=8*(x(1)-5);
%G(2)=2*(x(2)-6);
H(1,1)=8;
H(1,2)=0;
H(2,2)=2;
H(2,1)=H(1,2);
