Actual source code: ex40.c
2: static char help[] = "Tests mirror boundary conditions in 2-d.\n\n";
4: #include <petscdm.h>
5: #include <petscdmda.h>
7: int main(int argc, char **argv)
8: {
9: PetscInt M = 8, N = 8, stencil_width = 1, dof = 1, m, n, xstart, ystart, i, j, c;
10: DM da;
11: Vec global, local;
12: PetscScalar ***vglobal;
13: PetscViewer sview;
15: PetscFunctionBeginUser;
16: PetscCall(PetscInitialize(&argc, &argv, (char *)0, help));
17: PetscCall(PetscOptionsGetInt(NULL, 0, "-stencil_width", &stencil_width, 0));
18: PetscCall(PetscOptionsGetInt(NULL, 0, "-dof", &dof, 0));
20: PetscCall(DMDACreate2d(PETSC_COMM_WORLD, DM_BOUNDARY_MIRROR, DM_BOUNDARY_MIRROR, DMDA_STENCIL_STAR, M, N, PETSC_DECIDE, PETSC_DECIDE, dof, stencil_width, NULL, NULL, &da));
21: PetscCall(DMSetFromOptions(da));
22: PetscCall(DMSetUp(da));
23: PetscCall(DMDAGetCorners(da, &xstart, &ystart, 0, &m, &n, 0));
25: PetscCall(DMCreateGlobalVector(da, &global));
26: PetscCall(DMDAVecGetArrayDOF(da, global, &vglobal));
27: for (j = ystart; j < ystart + n; j++) {
28: for (i = xstart; i < xstart + m; i++) {
29: for (c = 0; c < dof; c++) vglobal[j][i][c] = 100 * j + 10 * (i + 1) + c;
30: }
31: }
32: PetscCall(DMDAVecRestoreArrayDOF(da, global, &vglobal));
34: PetscCall(DMCreateLocalVector(da, &local));
35: PetscCall(DMGlobalToLocalBegin(da, global, INSERT_VALUES, local));
36: PetscCall(DMGlobalToLocalEnd(da, global, INSERT_VALUES, local));
38: PetscCall(PetscViewerGetSubViewer(PETSC_VIEWER_STDOUT_WORLD, PETSC_COMM_SELF, &sview));
39: PetscCall(VecView(local, sview));
40: PetscCall(PetscViewerRestoreSubViewer(PETSC_VIEWER_STDOUT_WORLD, PETSC_COMM_SELF, &sview));
41: PetscCall(PetscViewerFlush(PETSC_VIEWER_STDOUT_WORLD));
42: PetscCall(VecView(global, PETSC_VIEWER_STDOUT_WORLD));
44: PetscCall(DMDestroy(&da));
45: PetscCall(VecDestroy(&local));
46: PetscCall(VecDestroy(&global));
48: PetscCall(PetscFinalize());
49: return 0;
50: }
52: /*TEST
54: test:
56: test:
57: suffix: 2
58: nsize: 4
59: filter: grep -v "Vec Object"
61: TEST*/