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

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

  9: int main(int argc,char **argv)
 10: {
 12:   PetscInt       M = -8, N = -8,stencil_width = 1, dof = 1,m,n,xstart,ystart,i,j,c;
 13:   DM             da;
 14:   Vec            global,local;
 15:   PetscScalar    ***vglobal;

 17:   PetscInitialize(&argc,&argv,(char*)0,help);

 20:   PetscOptionsGetInt(0,"-stencil_width",&stencil_width,0);
 21:   PetscOptionsGetInt(0,"-dof",&dof,0);

 23:   DMDACreate2d(PETSC_COMM_WORLD,DM_BOUNDARY_MIRROR,DM_BOUNDARY_MIRROR,DMDA_STENCIL_STAR,M,N,PETSC_DECIDE,PETSC_DECIDE,dof,stencil_width,NULL,NULL,&da);
 24:   DMDAGetCorners(da,&xstart,&ystart,0,&m,&n,0);

 26:   DMCreateGlobalVector(da,&global);
 27:   DMDAVecGetArrayDOF(da,global,&vglobal);
 28:   for (j=ystart; j<ystart+n; j++) {
 29:     for (i=xstart; i<xstart+m; i++) {
 30:       for (c=0; c<dof; c++) {
 31:         vglobal[j][i][c] = 100*j + 10*(i+1) + c;
 32:       }
 33:     }
 34:   }
 35:   DMDAVecRestoreArrayDOF(da,global,&vglobal);

 37:   DMCreateLocalVector(da,&local);
 38:   DMGlobalToLocalBegin(da,global,INSERT_VALUES,local);
 39:   DMGlobalToLocalEnd(da,global,INSERT_VALUES,local);

 41:   PetscSequentialPhaseBegin(PETSC_COMM_WORLD,1);
 42:   VecView(local,PETSC_VIEWER_STDOUT_SELF);
 43:   PetscSequentialPhaseEnd(PETSC_COMM_WORLD,1);
 44:   VecView(global,PETSC_VIEWER_STDOUT_WORLD);

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

 50:   PetscFinalize();
 51:   return 0;
 52: }