What Is Optimization Toolbox?

lsqnonlinMaxPCGIterMaximum number of PCG (preconditionedconjugate gradient) iterations (see “Algorithm”on page 8-175).PrecondBandWidth Upper bandwidth of preconditioner for PCG. Bydefault, diagonal preconditioning is used (upperbandwidth of 0). For some problems, increasingthe bandwidth reduces the number of PCGiterations. Setting PrecondBandWidth to 'Inf'uses a direct factorization (Cholesky) ratherthan the conjugate gradients (CG). The directfactorization is computationally more expensivethan CG, but produces a better quality steptowards the solution.TolPCGTermination tolerance on the PCG iteration.Medium-Scale Algorithm OnlyThese options are used only by the medium-scale algorithm:LevenbergMarquardtLineSearchTypeChoose Levenberg-Marquardt overGauss-Newton algorithm.Line search algorithm choice.ExamplesFind x that minimizesstarting at the point x = [0.3, 0.4].Because lsqnonlin assumes that the sum of squares is not explicitlyformed in the user-defined function, the function passed to lsqnonlinshould instead compute the vector-valued function8-174