function H=htest12(x)
// Gradient of Himmelblau, 1972
// x0 = [8, 9]'
// Xo = [5, 6]'
// S(xo) = 0

H(1,1)=8;
H(1,2)=0;
H(2,1)=H(1,2);
H(2,2)=2;

endfunction
