1: static char help[] = "Tests DMDAVecGetArrayDOF()\n";
  2: #include <petscdmda.h>

  4: int main(int argc, char *argv[])
  5: {
  6:   DM             da, daX, daY;
  7:   DMDALocalInfo  info;
  8:   MPI_Comm       commX, commY;
  9:   Vec            basisX, basisY;
 10:   PetscScalar    **arrayX, **arrayY;
 11:   const PetscInt *lx, *ly;
 12:   PetscInt       M     = 3, N = 3;
 13:   PetscInt       p     = 1;
 14:   PetscInt       numGP = 3;
 15:   PetscInt       dof   = 2*(p+1)*numGP;
 16:   PetscMPIInt    rank, subsize, subrank;

 19:   PetscInitialize(&argc,&argv,0,help);
 20:   MPI_Comm_rank(PETSC_COMM_WORLD, &rank);
 21:   /* Create 2D DMDA */
 22:   DMDACreate2d(PETSC_COMM_WORLD, DMDA_BOUNDARY_NONE, DMDA_BOUNDARY_NONE, DMDA_STENCIL_STAR, M, N, PETSC_DECIDE, PETSC_DECIDE, 1, 1, NULL, NULL, &da);
 23:   /* Create 1D DMDAs along two directions */
 24:   DMDAGetOwnershipRanges(da, &lx, &ly, NULL);
 25:   DMDAGetLocalInfo(da, &info);
 26:   DMDAGetProcessorSubsets(da, DMDA_X, &commX);
 27:   DMDAGetProcessorSubsets(da, DMDA_Y, &commY);
 28:   MPI_Comm_size(commX, &subsize);
 29:   MPI_Comm_rank(commX, &subrank);
 30:   PetscPrintf(PETSC_COMM_SELF, "[%d]X subrank: %d subsize: %d\n", rank, subrank, subsize);
 31:   MPI_Comm_size(commY, &subsize);
 32:   MPI_Comm_rank(commY, &subrank);
 33:   PetscPrintf(PETSC_COMM_SELF, "[%d]Y subrank: %d subsize: %d\n", rank, subrank, subsize);
 34:   DMDACreate1d(commX, DMDA_BOUNDARY_NONE, M, dof, 1, lx, &daX);
 35:   DMDACreate1d(commY, DMDA_BOUNDARY_NONE, N, dof, 1, ly, &daY);
 36:   /* Create 1D vectors for basis functions */
 37:   DMGetGlobalVector(daX, &basisX);
 38:   DMGetGlobalVector(daY, &basisY);
 39:   /* Extract basis functions */
 40:   DMDAVecGetArrayDOF(daX, basisX, &arrayX);
 41:   DMDAVecGetArrayDOF(daY, basisY, &arrayY);
 42:   /*arrayX[i][ndof]; */
 43:   /*arrayY[j][ndof]; */
 44:   DMDAVecRestoreArrayDOF(daX, basisX, &arrayX);
 45:   DMDAVecRestoreArrayDOF(daY, basisY, &arrayY);
 46:   /* Return basis vectors */
 47:   DMRestoreGlobalVector(daX, &basisX);
 48:   DMRestoreGlobalVector(daY, &basisY);
 49:   /* Cleanup */
 50:   DMDestroy(&daX);
 51:   DMDestroy(&daY);
 52:   DMDestroy(&da);
 53:   PetscFinalize();
 54:   return 0;
 55: }