Actual source code: ssls.c
petsc-3.5.4 2015-05-23
1: #include <../src/tao/complementarity/impls/ssls/ssls.h>
3: /*------------------------------------------------------------*/
6: PetscErrorCode TaoSetFromOptions_SSLS(Tao tao)
7: {
8: TAO_SSLS *ssls = (TAO_SSLS *)tao->data;
10: PetscBool flg;
13: PetscOptionsHead("Semismooth method with a linesearch for complementarity problems");
14: PetscOptionsReal("-ssls_delta", "descent test fraction", "",ssls->delta, &(ssls->delta), &flg);
15: PetscOptionsReal("-ssls_rho", "descent test power", "",ssls->rho, &(ssls->rho), &flg);
16: TaoLineSearchSetFromOptions(tao->linesearch);
17: KSPSetFromOptions(tao->ksp);
18: PetscOptionsTail();
19: return(0);
20: }
22: /*------------------------------------------------------------*/
25: PetscErrorCode TaoView_SSLS(Tao tao, PetscViewer pv)
26: {
28: return(0);
29: }
31: /*------------------------------------------------------------*/
34: PetscErrorCode Tao_SSLS_Function(TaoLineSearch ls, Vec X, PetscReal *fcn, void *ptr)
35: {
36: Tao tao = (Tao)ptr;
37: TAO_SSLS *ssls = (TAO_SSLS *)tao->data;
41: TaoComputeConstraints(tao, X, tao->constraints);
42: VecFischer(X,tao->constraints,tao->XL,tao->XU,ssls->ff);
43: VecNorm(ssls->ff,NORM_2,&ssls->merit);
44: *fcn = 0.5*ssls->merit*ssls->merit;
45: return(0);
46: }
48: /*------------------------------------------------------------*/
51: PetscErrorCode Tao_SSLS_FunctionGradient(TaoLineSearch ls, Vec X, PetscReal *fcn, Vec G, void *ptr)
52: {
53: Tao tao = (Tao)ptr;
54: TAO_SSLS *ssls = (TAO_SSLS *)tao->data;
58: TaoComputeConstraints(tao, X, tao->constraints);
59: VecFischer(X,tao->constraints,tao->XL,tao->XU,ssls->ff);
60: VecNorm(ssls->ff,NORM_2,&ssls->merit);
61: *fcn = 0.5*ssls->merit*ssls->merit;
63: TaoComputeJacobian(tao,tao->solution,tao->jacobian,tao->jacobian_pre);
65: MatDFischer(tao->jacobian, tao->solution, tao->constraints,tao->XL, tao->XU, ssls->t1, ssls->t2,ssls->da, ssls->db);
66: MatDiagonalScale(tao->jacobian,ssls->db,NULL);
67: MatDiagonalSet(tao->jacobian,ssls->da,ADD_VALUES);
68: MatMultTranspose(tao->jacobian,ssls->ff,G);
69: return(0);
70: }