Actual source code: none.c


  2: /*
  3:     Identity preconditioner, simply copies vector x to y.
  4: */
  5: #include <petsc/private/pcimpl.h>

  7: PetscErrorCode PCApply_None(PC pc,Vec x,Vec y)
  8: {
  9:   VecCopy(x,y);
 10:   return 0;
 11: }

 13: PetscErrorCode PCMatApply_None(PC pc,Mat X,Mat Y)
 14: {
 15:   MatCopy(X,Y,SAME_NONZERO_PATTERN);
 16:   return 0;
 17: }

 19: /*MC
 20:      PCNONE - This is used when you wish to employ a nonpreconditioned
 21:              Krylov method.

 23:    Level: beginner

 25:   Notes:
 26:     This is implemented by a VecCopy()

 28: .seealso:  PCCreate(), PCSetType(), PCType (for list of available types), PC
 29: M*/

 31: PETSC_EXTERN PetscErrorCode PCCreate_None(PC pc)
 32: {
 33:   pc->ops->apply               = PCApply_None;
 34:   pc->ops->matapply            = PCMatApply_None;
 35:   pc->ops->applytranspose      = PCApply_None;
 36:   pc->ops->destroy             = NULL;
 37:   pc->ops->setup               = NULL;
 38:   pc->ops->view                = NULL;
 39:   pc->ops->applysymmetricleft  = PCApply_None;
 40:   pc->ops->applysymmetricright = PCApply_None;

 42:   pc->data = NULL;
 43:   return 0;
 44: }