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*/