Actual source code: none.c
petsc-3.10.5 2019-03-28
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      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: {

     12:   VecCopy(x,y);
     13:   return(0);
     14: }

     16: /*MC
     17:      PCNONE - This is used when you wish to employ a nonpreconditioned
     18:              Krylov method.

     20:    Level: beginner

     22:   Concepts: preconditioners

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

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

     30: PETSC_EXTERN PetscErrorCode PCCreate_None(PC pc)
     31: {
     33:   pc->ops->apply               = PCApply_None;
     34:   pc->ops->applytranspose      = PCApply_None;
     35:   pc->ops->destroy             = 0;
     36:   pc->ops->setup               = 0;
     37:   pc->ops->view                = 0;
     38:   pc->ops->applysymmetricleft  = PCApply_None;
     39:   pc->ops->applysymmetricright = PCApply_None;

     41:   pc->data = 0;
     42:   return(0);
     43: }