What Is Optimization Toolbox?

2 Tutorialexitflag =3output =iterations: 18algorithm: 'large-scale: reflective trust-region'firstorderopt: 0.0028cgiterations: 50message: [1x206 char]After 18 iterations with a total of 30 PCG iterations, the function value isreduced tofval =-1.0538e+003and the first-order optimality isoutput.firstorderopt =0.0043PreconditioningIn this example, quadprog cannot use H to compute a preconditioner becauseH only exists implicitly. Instead, quadprog uses B, the argument passed ininstead of H, to compute a preconditioner. B is a good choice because it is thesame size as H and approximates H to some degree. If B were not the samesize as H, quadprog would compute a preconditioner based on some diagonalscaling matrices determined from the algorithm. Typically, this would notperform as well.Because the preconditioner is more approximate than when H is availableexplicitly, adjusting the TolPcg parameter to a somewhat smaller valuemightberequired.Thisexampleisthesame as the previous one, but reducesTolPcg from the default 0.1 to 0.01.function [fval, exitflag, output, x] = runqpbox4prec2-70