Actual source code: ex41.c
2: static char help[] = "Tests mirror boundary conditions in 3-d.\n\n";
4: #include <petscdm.h>
5: #include <petscdmda.h>
7: int main(int argc, char **argv)
8: {
9: PetscInt M = 2, N = 3, P = 4, stencil_width = 1, dof = 1, m, n, p, xstart, ystart, zstart, i, j, k, c;
10: DM da;
11: Vec global, local;
12: PetscScalar ****vglobal;
13: PetscViewer sview;
14: PetscScalar sum;
16: PetscFunctionBeginUser;
17: PetscCall(PetscInitialize(&argc, &argv, (char *)0, help));
18: PetscCall(PetscOptionsGetInt(NULL, 0, "-stencil_width", &stencil_width, 0));
19: PetscCall(PetscOptionsGetInt(NULL, 0, "-dof", &dof, 0));
21: PetscCall(DMDACreate3d(PETSC_COMM_WORLD, DM_BOUNDARY_MIRROR, DM_BOUNDARY_MIRROR, DM_BOUNDARY_MIRROR, DMDA_STENCIL_STAR, M, N, P, PETSC_DECIDE, PETSC_DECIDE, PETSC_DECIDE, dof, stencil_width, NULL, NULL, NULL, &da));
22: PetscCall(DMSetFromOptions(da));
23: PetscCall(DMSetUp(da));
24: PetscCall(DMDAGetCorners(da, &xstart, &ystart, &zstart, &m, &n, &p));
26: PetscCall(DMCreateGlobalVector(da, &global));
27: PetscCall(DMDAVecGetArrayDOF(da, global, &vglobal));
28: for (k = zstart; k < zstart + p; k++) {
29: for (j = ystart; j < ystart + n; j++) {
30: for (i = xstart; i < xstart + m; i++) {
31: for (c = 0; c < dof; c++) vglobal[k][j][i][c] = 1000 * k + 100 * j + 10 * i + c;
32: }
33: }
34: }
35: PetscCall(DMDAVecRestoreArrayDOF(da, global, &vglobal));
37: PetscCall(DMCreateLocalVector(da, &local));
38: PetscCall(DMGlobalToLocalBegin(da, global, ADD_VALUES, local));
39: PetscCall(DMGlobalToLocalEnd(da, global, ADD_VALUES, local));
41: PetscCall(VecSum(local, &sum));
42: PetscCall(PetscSynchronizedPrintf(PETSC_COMM_WORLD, "sum %g\n", (double)PetscRealPart(sum)));
43: PetscCall(PetscSynchronizedFlush(PETSC_COMM_WORLD, stdout));
44: PetscCall(PetscViewerGetSubViewer(PETSC_VIEWER_STDOUT_WORLD, PETSC_COMM_SELF, &sview));
45: PetscCall(VecView(local, sview));
46: PetscCall(PetscViewerRestoreSubViewer(PETSC_VIEWER_STDOUT_WORLD, PETSC_COMM_SELF, &sview));
47: PetscCall(PetscViewerFlush(PETSC_VIEWER_STDOUT_WORLD));
49: PetscCall(DMDestroy(&da));
50: PetscCall(VecDestroy(&local));
51: PetscCall(VecDestroy(&global));
53: PetscCall(PetscFinalize());
54: return 0;
55: }
57: /*TEST
59: test:
61: test:
62: suffix: 2
63: nsize: 3
65: TEST*/