Optimal Algorithms and the BFGS Updating Techniques for Solving Unconstrained Nonlinear Minimization Problems

Figure 6

For the Powell problem, comparing (a) the residuals and (b) 𝛼 obtained by the OABFGS1 and GOABFGS1 with DFP and showing (c) the residual and (d) 𝛼 obtained by OABFGS2.

(a)

(b)

(c)

(d)