compare steepest descent optimal step with conjugate gradient

The objective function is $f (u) = (11 - u_{1} - u_{2})^{2} + (1 + u_{1} + 10 u_{2} - u_{1} u_{2})^{2}$ Starting from $u^{0} = {14; 23.59}$ .




steepest descent, optimal step size, 76 iterations	conjugate gradient, Polak-Ribiere formula, 14 iterations. Completes much faster with less itreations.