Actual source code: ex39.c

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

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

  6: int main(int argc, char **argv)
  7: {
  8:   PetscInt      M = 6, stencil_width = 1, dof = 1, m, xstart, i, j;
  9:   DM            da;
 10:   Vec           global, local;
 11:   PetscScalar **vglobal;
 12:   PetscViewer   sviewer;

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

 19:   PetscCall(DMDACreate1d(PETSC_COMM_WORLD, DM_BOUNDARY_MIRROR, M, dof, stencil_width, NULL, &da));
 20:   PetscCall(DMSetFromOptions(da));
 21:   PetscCall(DMSetUp(da));
 22:   PetscCall(DMDAGetCorners(da, &xstart, 0, 0, &m, 0, 0));

 24:   PetscCall(DMCreateGlobalVector(da, &global));
 25:   PetscCall(DMDAVecGetArrayDOF(da, global, &vglobal));
 26:   for (i = xstart; i < xstart + m; i++) {
 27:     for (j = 0; j < dof; j++) vglobal[i][j] = 100 * (i + 1) + j;
 28:   }
 29:   PetscCall(DMDAVecRestoreArrayDOF(da, global, &vglobal));

 31:   PetscCall(DMCreateLocalVector(da, &local));
 32:   PetscCall(DMGlobalToLocalBegin(da, global, INSERT_VALUES, local));
 33:   PetscCall(DMGlobalToLocalEnd(da, global, INSERT_VALUES, local));

 35:   PetscCall(PetscViewerGetSubViewer(PETSC_VIEWER_STDOUT_WORLD, PETSC_COMM_SELF, &sviewer));
 36:   PetscCall(VecView(local, sviewer));
 37:   PetscCall(PetscViewerRestoreSubViewer(PETSC_VIEWER_STDOUT_WORLD, PETSC_COMM_SELF, &sviewer));
 38:   PetscCall(VecView(global, PETSC_VIEWER_STDOUT_WORLD));

 40:   PetscCall(DMDestroy(&da));
 41:   PetscCall(VecDestroy(&local));
 42:   PetscCall(VecDestroy(&global));

 44:   PetscCall(PetscFinalize());
 45:   return 0;
 46: }

 48: /*TEST

 50:    test:

 52:    test:
 53:       suffix: 2
 54:       nsize: 2
 55:       filter: grep -v "Vec Object"

 57: TEST*/