1 2 /* 3 Identity preconditioner, simply copies vector x to y. 4 */ 5 #include <petsc/private/pcimpl.h> /*I "petscpc.h" I*/ 6 7 PetscErrorCode PCApply_None(PC pc,Vec x,Vec y) 8 { 9 PetscFunctionBegin; 10 PetscCall(VecCopy(x,y)); 11 PetscFunctionReturn(0); 12 } 13 14 PetscErrorCode PCMatApply_None(PC pc,Mat X,Mat Y) 15 { 16 PetscFunctionBegin; 17 PetscCall(MatCopy(X,Y,SAME_NONZERO_PATTERN)); 18 PetscFunctionReturn(0); 19 } 20 21 /*MC 22 PCNONE - This is used when you wish to employ a nonpreconditioned 23 Krylov method. 24 25 Level: beginner 26 27 Notes: 28 This is implemented by a VecCopy() 29 30 .seealso: PCCreate(), PCSetType(), PCType (for list of available types), PC 31 M*/ 32 33 PETSC_EXTERN PetscErrorCode PCCreate_None(PC pc) 34 { 35 PetscFunctionBegin; 36 pc->ops->apply = PCApply_None; 37 pc->ops->matapply = PCMatApply_None; 38 pc->ops->applytranspose = PCApply_None; 39 pc->ops->destroy = NULL; 40 pc->ops->setup = NULL; 41 pc->ops->view = NULL; 42 pc->ops->applysymmetricleft = PCApply_None; 43 pc->ops->applysymmetricright = PCApply_None; 44 45 pc->data = NULL; 46 PetscFunctionReturn(0); 47 } 48