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: {
 10:   PetscInt       M = 6,stencil_width = 1, dof = 1,m,xstart,i,j;
 11:   DM             da;
 12:   Vec            global,local;
 13:   PetscScalar    **vglobal;
 14:   PetscViewer    sviewer;

 16:   PetscInitialize(&argc,&argv,(char*)0,help);if (ierr) return ierr;
 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++) {
 29:       vglobal[i][j] = 100*(i+1) + j;
 30:     }
 31:   }
 32:   DMDAVecRestoreArrayDOF(da,global,&vglobal);

 34:   DMCreateLocalVector(da,&local);
 35:   DMGlobalToLocalBegin(da,global,INSERT_VALUES,local);
 36:   DMGlobalToLocalEnd(da,global,INSERT_VALUES,local);

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

 44:   DMDestroy(&da);
 45:   VecDestroy(&local);
 46:   VecDestroy(&global);

 48:   PetscFinalize();
 49:   return ierr;
 50: }

 52: /*TEST

 54:    test:

 56:    test:
 57:       suffix: 2
 58:       nsize: 2
 59:       filter: grep -v "Vec Object"

 61: TEST*/