Actual source code: ssls.c

petsc-master 2019-08-22
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  1:  #include <../src/tao/complementarity/impls/ssls/ssls.h>

  3: /*------------------------------------------------------------*/
  4: PetscErrorCode TaoSetFromOptions_SSLS(PetscOptionItems *PetscOptionsObject,Tao tao)
  5: {
  6:   TAO_SSLS       *ssls = (TAO_SSLS *)tao->data;

 10:   PetscOptionsHead(PetscOptionsObject,"Semismooth method with a linesearch for complementarity problems");
 11:   PetscOptionsReal("-ssls_delta", "descent test fraction", "",ssls->delta, &ssls->delta, NULL);
 12:   PetscOptionsReal("-ssls_rho", "descent test power", "",ssls->rho, &ssls->rho, NULL);
 13:   TaoLineSearchSetFromOptions(tao->linesearch);
 14:   KSPSetFromOptions(tao->ksp);
 15:   PetscOptionsTail();
 16:   return(0);
 17: }

 19: /*------------------------------------------------------------*/
 20: PetscErrorCode TaoView_SSLS(Tao tao, PetscViewer pv)
 21: {
 23:   return(0);
 24: }

 26: /*------------------------------------------------------------*/
 27: PetscErrorCode Tao_SSLS_Function(TaoLineSearch ls, Vec X, PetscReal *fcn, void *ptr)
 28: {
 29:   Tao            tao = (Tao)ptr;
 30:   TAO_SSLS       *ssls = (TAO_SSLS *)tao->data;

 34:   TaoComputeConstraints(tao, X, tao->constraints);
 35:   VecFischer(X,tao->constraints,tao->XL,tao->XU,ssls->ff);
 36:   VecNorm(ssls->ff,NORM_2,&ssls->merit);
 37:   *fcn = 0.5*ssls->merit*ssls->merit;
 38:   return(0);
 39: }

 41: /*------------------------------------------------------------*/
 42: PetscErrorCode Tao_SSLS_FunctionGradient(TaoLineSearch ls, Vec X, PetscReal *fcn,  Vec G, void *ptr)
 43: {
 44:   Tao            tao = (Tao)ptr;
 45:   TAO_SSLS       *ssls = (TAO_SSLS *)tao->data;

 49:   TaoComputeConstraints(tao, X, tao->constraints);
 50:   VecFischer(X,tao->constraints,tao->XL,tao->XU,ssls->ff);
 51:   VecNorm(ssls->ff,NORM_2,&ssls->merit);
 52:   *fcn = 0.5*ssls->merit*ssls->merit;

 54:   TaoComputeJacobian(tao,tao->solution,tao->jacobian,tao->jacobian_pre);

 56:   MatDFischer(tao->jacobian, tao->solution, tao->constraints,tao->XL, tao->XU, ssls->t1, ssls->t2,ssls->da, ssls->db);
 57:   MatDiagonalScale(tao->jacobian,ssls->db,NULL);
 58:   MatDiagonalSet(tao->jacobian,ssls->da,ADD_VALUES);
 59:   MatMultTranspose(tao->jacobian,ssls->ff,G);
 60:   return(0);
 61: }