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: }