2: /*
3: Identity preconditioner, simply copies vector x to y.
4: */
5: #include <private/pcimpl.h> /*I "petscpc.h" I*/
9: PetscErrorCode PCApply_None(PC pc,Vec x,Vec y)
10: {
14: VecCopy(x,y);
15: return(0);
16: }
18: /*MC
19: PCNONE - This is used when you wish to employ a nonpreconditioned
20: Krylov method.
22: Level: beginner
24: Concepts: preconditioners
26: Notes: This is implemented by a VecCopy()
28: .seealso: PCCreate(), PCSetType(), PCType (for list of available types), PC
29: M*/
34: PetscErrorCode PCCreate_None(PC pc)
35: {
37: pc->ops->apply = PCApply_None;
38: pc->ops->applytranspose = PCApply_None;
39: pc->ops->destroy = 0;
40: pc->ops->setup = 0;
41: pc->ops->view = 0;
42: pc->ops->applysymmetricleft = PCApply_None;
43: pc->ops->applysymmetricright = PCApply_None;
45: pc->data = 0;
46: return(0);
47: }