Actual source code: ex39.c


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

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

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

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

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

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

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

 36:   PetscViewerGetSubViewer(PETSC_VIEWER_STDOUT_WORLD, PETSC_COMM_SELF, &sviewer);
 37:   VecView(local, sviewer);
 38:   PetscViewerRestoreSubViewer(PETSC_VIEWER_STDOUT_WORLD, PETSC_COMM_SELF, &sviewer);
 39:   PetscViewerFlush(PETSC_VIEWER_STDOUT_WORLD);
 40:   VecView(global, PETSC_VIEWER_STDOUT_WORLD);

 42:   DMDestroy(&da);
 43:   VecDestroy(&local);
 44:   VecDestroy(&global);

 46:   PetscFinalize();
 47:   return 0;
 48: }

 50: /*TEST

 52:    test:

 54:    test:
 55:       suffix: 2
 56:       nsize: 2
 57:       filter: grep -v "Vec Object"

 59: TEST*/