Actual source code: ex41.c

  1: static char help[] = "Tests mirror boundary conditions in 3-d.\n\n";

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

  6: int main(int argc, char **argv)
  7: {
  8:   PetscInt        M = 4, N = 5, P = 6, stencil_width = 1, dof = 1, m, n, p, xstart, ystart, zstart, i, j, k, c;
  9:   DM              da;
 10:   Vec             global, local;
 11:   PetscScalar ****vglobal;
 12:   PetscViewer     sview;
 13:   PetscScalar     sum;

 15:   PetscFunctionBeginUser;
 16:   PetscCall(PetscInitialize(&argc, &argv, NULL, help));
 17:   PetscCall(PetscOptionsGetInt(NULL, 0, "-stencil_width", &stencil_width, 0));
 18:   PetscCall(PetscOptionsGetInt(NULL, 0, "-dof", &dof, 0));

 20:   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));
 21:   PetscCall(DMSetFromOptions(da));
 22:   PetscCall(DMSetUp(da));
 23:   PetscCall(DMDAGetCorners(da, &xstart, &ystart, &zstart, &m, &n, &p));

 25:   PetscCall(DMCreateGlobalVector(da, &global));
 26:   PetscCall(DMDAVecGetArrayDOF(da, global, &vglobal));
 27:   for (k = zstart; k < zstart + p; k++) {
 28:     for (j = ystart; j < ystart + n; j++) {
 29:       for (i = xstart; i < xstart + m; i++) {
 30:         for (c = 0; c < dof; c++) vglobal[k][j][i][c] = 1000 * k + 100 * j + 10 * i + c;
 31:       }
 32:     }
 33:   }
 34:   PetscCall(DMDAVecRestoreArrayDOF(da, global, &vglobal));

 36:   PetscCall(DMCreateLocalVector(da, &local));
 37:   PetscCall(DMGlobalToLocalBegin(da, global, ADD_VALUES, local));
 38:   PetscCall(DMGlobalToLocalEnd(da, global, ADD_VALUES, local));

 40:   PetscCall(VecSum(local, &sum));
 41:   PetscCall(PetscSynchronizedPrintf(PETSC_COMM_WORLD, "sum %g\n", (double)PetscRealPart(sum)));
 42:   PetscCall(PetscSynchronizedFlush(PETSC_COMM_WORLD, stdout));
 43:   PetscCall(PetscViewerGetSubViewer(PETSC_VIEWER_STDOUT_WORLD, PETSC_COMM_SELF, &sview));
 44:   PetscCall(VecView(local, sview));
 45:   PetscCall(PetscViewerRestoreSubViewer(PETSC_VIEWER_STDOUT_WORLD, PETSC_COMM_SELF, &sview));

 47:   PetscCall(DMDestroy(&da));
 48:   PetscCall(VecDestroy(&local));
 49:   PetscCall(VecDestroy(&global));

 51:   PetscCall(PetscFinalize());
 52:   return 0;
 53: }

 55: /*TEST

 57:    test:

 59:    test:
 60:      suffix: 2
 61:      nsize: 3

 63: TEST*/