Actual source code: ex15.c

  1: static char help[] = "Tests DMDA interpolation.\n\n";

  3: #include <petscdm.h>
  4: #include <petscdmda.h>

  6: int main(int argc, char **argv)
  7: {
  8:   PetscInt       M1 = 3, M2, dof = 1, s = 1, ratio = 2, dim = 1;
  9:   DM             da_c, da_f;
 10:   Vec            v_c, v_f;
 11:   Mat            Interp;
 12:   PetscScalar    one = 1.0;
 13:   PetscBool      pt;
 14:   DMBoundaryType bx = DM_BOUNDARY_NONE, by = DM_BOUNDARY_NONE, bz = DM_BOUNDARY_NONE;

 16:   PetscFunctionBeginUser;
 17:   PetscCall(PetscInitialize(&argc, &argv, (char *)0, help));
 18:   PetscCall(PetscOptionsGetInt(NULL, NULL, "-dim", &dim, NULL));
 19:   PetscCall(PetscOptionsGetInt(NULL, NULL, "-M", &M1, NULL));
 20:   PetscCall(PetscOptionsGetInt(NULL, NULL, "-stencil_width", &s, NULL));
 21:   PetscCall(PetscOptionsGetInt(NULL, NULL, "-ratio", &ratio, NULL));
 22:   PetscCall(PetscOptionsGetInt(NULL, NULL, "-dof", &dof, NULL));
 23:   PetscCall(PetscOptionsGetBool(NULL, NULL, "-periodic", (PetscBool *)&pt, NULL));

 25:   if (pt) {
 26:     if (dim > 0) bx = DM_BOUNDARY_PERIODIC;
 27:     if (dim > 1) by = DM_BOUNDARY_PERIODIC;
 28:     if (dim > 2) bz = DM_BOUNDARY_PERIODIC;
 29:   }
 30:   if (bx == DM_BOUNDARY_NONE) {
 31:     M2 = ratio * (M1 - 1) + 1;
 32:   } else {
 33:     M2 = ratio * M1;
 34:   }

 36:   /* Set up the array */
 37:   if (dim == 1) {
 38:     PetscCall(DMDACreate1d(PETSC_COMM_WORLD, bx, M1, dof, s, NULL, &da_c));
 39:     PetscCall(DMDACreate1d(PETSC_COMM_WORLD, bx, M2, dof, s, NULL, &da_f));
 40:   } else if (dim == 2) {
 41:     PetscCall(DMDACreate2d(PETSC_COMM_WORLD, bx, by, DMDA_STENCIL_BOX, M1, M1, PETSC_DECIDE, PETSC_DECIDE, dof, s, NULL, NULL, &da_c));
 42:     PetscCall(DMDACreate2d(PETSC_COMM_WORLD, bx, by, DMDA_STENCIL_BOX, M2, M2, PETSC_DECIDE, PETSC_DECIDE, dof, s, NULL, NULL, &da_f));
 43:   } else if (dim == 3) {
 44:     PetscCall(DMDACreate3d(PETSC_COMM_WORLD, bx, by, bz, DMDA_STENCIL_BOX, M1, M1, M1, PETSC_DECIDE, PETSC_DECIDE, PETSC_DECIDE, dof, s, NULL, NULL, NULL, &da_c));
 45:     PetscCall(DMDACreate3d(PETSC_COMM_WORLD, bx, by, bz, DMDA_STENCIL_BOX, M2, M2, M2, PETSC_DECIDE, PETSC_DECIDE, PETSC_DECIDE, dof, s, NULL, NULL, NULL, &da_f));
 46:   } else SETERRQ(PETSC_COMM_WORLD, PETSC_ERR_SUP, "dim must be 1,2, or 3");
 47:   PetscCall(DMSetFromOptions(da_c));
 48:   PetscCall(DMSetUp(da_c));
 49:   PetscCall(DMSetFromOptions(da_f));
 50:   PetscCall(DMSetUp(da_f));

 52:   PetscCall(DMCreateGlobalVector(da_c, &v_c));
 53:   PetscCall(DMCreateGlobalVector(da_f, &v_f));

 55:   PetscCall(VecSet(v_c, one));
 56:   PetscCall(DMCreateInterpolation(da_c, da_f, &Interp, NULL));
 57:   PetscCall(MatMult(Interp, v_c, v_f));
 58:   PetscCall(VecView(v_f, PETSC_VIEWER_STDOUT_WORLD));
 59:   PetscCall(MatMultTranspose(Interp, v_f, v_c));
 60:   PetscCall(VecView(v_c, PETSC_VIEWER_STDOUT_WORLD));

 62:   PetscCall(MatDestroy(&Interp));
 63:   PetscCall(VecDestroy(&v_c));
 64:   PetscCall(DMDestroy(&da_c));
 65:   PetscCall(VecDestroy(&v_f));
 66:   PetscCall(DMDestroy(&da_f));
 67:   PetscCall(PetscFinalize());
 68:   return 0;
 69: }