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