2: static char help[] = "Tests various 1-dimensional DMDA routines.\n\n";

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

 10: int main(int argc,char **argv)
 11: {
 12:   PetscMPIInt      rank;
 13:   PetscInt         M  = 13,s=1,dof=1;
 14:   DMBoundaryType bx = DM_BOUNDARY_PERIODIC;
 15:   PetscErrorCode   ierr;
 16:   DM               da;
 17:   PetscViewer      viewer;
 18:   Vec              local,global;
 19:   PetscScalar      value;
 20:   PetscDraw        draw;
 21:   PetscBool        flg = PETSC_FALSE;

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

 25:   /* Create viewers */
 26:   PetscViewerDrawOpen(PETSC_COMM_WORLD,0,"",280,480,600,200,&viewer);
 27:   PetscViewerDrawGetDraw(viewer,0,&draw);
 28:   PetscDrawSetDoubleBuffer(draw);

 30:   /* Readoptions */
 31:   PetscOptionsGetInt(NULL,"-M",&M,NULL);
 32:   PetscOptionsGetEnum(NULL,"-wrap",DMBoundaryTypes,(PetscEnum*)&bx,NULL);
 33:   PetscOptionsGetInt(NULL,"-dof",&dof,NULL);
 34:   PetscOptionsGetInt(NULL,"-s",&s,NULL);

 36:   /* Create distributed array and get vectors */
 37:   DMDACreate1d(PETSC_COMM_WORLD,bx,M,dof,s,NULL,&da);
 38:   DMView(da,viewer);
 39:   DMCreateGlobalVector(da,&global);
 40:   DMCreateLocalVector(da,&local);

 42:   /* Set global vector; send ghost points to local vectors */
 43:   value = 1;
 44:   VecSet(global,value);
 45:   DMGlobalToLocalBegin(da,global,INSERT_VALUES,local);
 46:   DMGlobalToLocalEnd(da,global,INSERT_VALUES,local);

 48:   /* Scale local vectors according to processor rank; pass to global vector */
 49:   MPI_Comm_rank(PETSC_COMM_WORLD,&rank);
 50:   value = rank+1;
 51:   VecScale(local,value);
 52:   DMLocalToGlobalBegin(da,local,INSERT_VALUES,global);
 53:   DMLocalToGlobalEnd(da,local,INSERT_VALUES,global);

 55:   VecView(global,viewer);
 56:   PetscPrintf(PETSC_COMM_WORLD,"\nGlobal Vector:\n");
 57:   VecView(global,PETSC_VIEWER_STDOUT_WORLD);
 58:   PetscPrintf(PETSC_COMM_WORLD,"\n");

 60:   /* Send ghost points to local vectors */
 61:   DMGlobalToLocalBegin(da,global,INSERT_VALUES,local);
 62:   DMGlobalToLocalEnd(da,global,INSERT_VALUES,local);

 64:   PetscOptionsGetBool(NULL,"-local_print",&flg,NULL);
 65:   if (flg) {
 66:     PetscViewer            sviewer;
 67:     ISLocalToGlobalMapping is;

 69:     PetscViewerASCIISynchronizedAllow(PETSC_VIEWER_STDOUT_WORLD,PETSC_TRUE);
 70:     PetscSynchronizedPrintf(PETSC_COMM_WORLD,"\nLocal Vector: processor %d\n",rank);
 71:     PetscViewerGetSingleton(PETSC_VIEWER_STDOUT_WORLD,&sviewer);
 72:     VecView(local,sviewer);
 73:     PetscViewerRestoreSingleton(PETSC_VIEWER_STDOUT_WORLD,&sviewer);
 74:     PetscSynchronizedFlush(PETSC_COMM_WORLD,PETSC_STDOUT);

 76:     PetscSynchronizedPrintf(PETSC_COMM_WORLD,"\nLocal to global mapping: processor %d\n",rank);
 77:     PetscViewerGetSingleton(PETSC_VIEWER_STDOUT_WORLD,&sviewer);
 78:     DMGetLocalToGlobalMapping(da,&is);
 79:     ISLocalToGlobalMappingView(is,sviewer);
 80:     PetscViewerRestoreSingleton(PETSC_VIEWER_STDOUT_WORLD,&sviewer);
 81:     PetscSynchronizedFlush(PETSC_COMM_WORLD,PETSC_STDOUT);
 82:   }

 84:   /* Free memory */
 85:   PetscViewerDestroy(&viewer);
 86:   VecDestroy(&global);
 87:   VecDestroy(&local);
 88:   DMDestroy(&da);
 89:   PetscFinalize();
 90:   return 0;
 91: }