C++ (Cpp) DMShellCreate Examples

Example #1

File: ex45.c Project: tom-klotz/petsc

int main(int argc, char **argv)
{
    Mat            A;
    KSP            ksp;
    DM             shell;
    Vec            *left, *right;
    MPI_Comm       c;
    PetscErrorCode ierr;

    ierr = PetscInitialize(&argc, &argv, NULL, NULL);if (ierr) return ierr;
    c = PETSC_COMM_WORLD;

    ierr = MatCreate(c, &A); CHKERRQ(ierr);
    ierr = MatSetSizes(A, 1, 1, PETSC_DECIDE, PETSC_DECIDE); CHKERRQ(ierr);
    ierr = MatSetFromOptions(A); CHKERRQ(ierr);
    ierr = MatSetUp(A); CHKERRQ(ierr);
    ierr = KSPCreate(c, &ksp); CHKERRQ(ierr);
    ierr = KSPSetOperators(ksp, A, A); CHKERRQ(ierr);
    ierr = KSPSetFromOptions(ksp); CHKERRQ(ierr);
    ierr = DMShellCreate(c, &shell); CHKERRQ(ierr);
    ierr = DMSetFromOptions(shell); CHKERRQ(ierr);
    ierr = DMSetUp(shell); CHKERRQ(ierr);
    ierr = KSPSetDM(ksp, shell); CHKERRQ(ierr);

    ierr = KSPCreateVecs(ksp, 1, &right, 1, &left); CHKERRQ(ierr);
    ierr = VecView(right[0], PETSC_VIEWER_STDOUT_(c));CHKERRQ(ierr);
    ierr = VecDestroyVecs(1,&right); CHKERRQ(ierr);
    ierr = VecDestroyVecs(1,&left); CHKERRQ(ierr);

    ierr = DMDestroy(&shell); CHKERRQ(ierr);
    ierr = KSPDestroy(&ksp); CHKERRQ(ierr);
    ierr = MatDestroy(&A); CHKERRQ(ierr);
    PetscFinalize();
    return 0;
}

Example #2

File: dmshell.c Project: plguhur/petsc

PetscErrorCode DMCreateSubDM_Shell(DM dm, PetscInt numFields, PetscInt fields[], IS *is, DM *subdm)
{
  PetscErrorCode ierr;

  PetscFunctionBegin;
  if (subdm) {ierr = DMShellCreate(PetscObjectComm((PetscObject) dm), subdm);CHKERRQ(ierr);}
  ierr = DMCreateSubDM_Section_Private(dm, numFields, fields, is, subdm);CHKERRQ(ierr);
  PetscFunctionReturn(0);
}

Example #3

File: iterativ.c Project: mchandra/petsc

/*@
   KSPGetDM - Gets the DM that may be used by some preconditioners

   Not Collective

   Input Parameter:
. ksp - the preconditioner context

   Output Parameter:
.  dm - the dm

   Level: intermediate


.seealso: KSPSetDM(), KSPSetDMActive()
@*/
PetscErrorCode  KSPGetDM(KSP ksp,DM *dm)
{
  PetscErrorCode ierr;

  PetscFunctionBegin;
  PetscValidHeaderSpecific(ksp,KSP_CLASSID,1);
  if (!ksp->dm) {
    ierr        = DMShellCreate(PetscObjectComm((PetscObject)ksp),&ksp->dm);CHKERRQ(ierr);
    ksp->dmAuto = PETSC_TRUE;
  }
  *dm = ksp->dm;
  PetscFunctionReturn(0);
}

Example #4

File: ex65.c Project: 000Justin000/ATPESC

static PetscErrorCode MyDMShellCreate(MPI_Comm comm,DM da,DM *shell)
{
  PetscErrorCode ierr;

  ierr = DMShellCreate(comm,shell);CHKERRQ(ierr);
  ierr = DMShellSetContext(*shell,da);CHKERRQ(ierr);
  ierr = DMShellSetCreateMatrix(*shell,CreateMatrix);CHKERRQ(ierr);
  ierr = DMShellSetCreateGlobalVector(*shell,CreateGlobalVector);CHKERRQ(ierr);
  ierr = DMShellSetCreateLocalVector(*shell,CreateLocalVector);CHKERRQ(ierr);
  ierr = DMShellSetRefine(*shell,Refine);CHKERRQ(ierr);
  ierr = DMShellSetCoarsen(*shell,Coarsen);CHKERRQ(ierr);
  ierr = DMShellSetCreateInterpolation(*shell,CreateInterpolation);CHKERRQ(ierr);
  ierr = DMShellSetCreateRestriction(*shell,CreateRestriction);CHKERRQ(ierr);
  return 0;
}