Actual source code: ex2.c

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

 4:  #include petscda.h
 5:  #include petscsys.h

  9: int main(int argc,char **argv)
 10: {
 11:   PetscMPIInt    rank;
 12:   PetscInt       M = 13,s=1,dof=1;
 13:   DAPeriodicType wrap = DA_XPERIODIC;
 15:   DA             da;
 16:   PetscViewer    viewer;
 17:   Vec            local,global;
 18:   PetscScalar    value;
 19:   PetscDraw      draw;
 20:   PetscTruth     flg;

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

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

 29:   /* Readoptions */
 30:   PetscOptionsGetInt(PETSC_NULL,"-M",&M,PETSC_NULL);
 31:   PetscOptionsGetEnum(PETSC_NULL,"-wrap",DAPeriodicTypes,(PetscEnum*)&wrap,PETSC_NULL);
 32:   PetscOptionsGetInt(PETSC_NULL,"-dof",&dof,PETSC_NULL);
 33:   PetscOptionsGetInt(PETSC_NULL,"-s",&s,PETSC_NULL);

 35:   /* Create distributed array and get vectors */
 36:   DACreate1d(PETSC_COMM_WORLD,wrap,M,dof,s,PETSC_NULL,&da);
 37:   DAView(da,viewer);
 38:   DACreateGlobalVector(da,&global);
 39:   DACreateLocalVector(da,&local);

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

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

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

 58:   /* Send ghost points to local vectors */
 59:   DAGlobalToLocalBegin(da,global,INSERT_VALUES,local);
 60:   DAGlobalToLocalEnd(da,global,INSERT_VALUES,local);

 62:   PetscOptionsHasName(PETSC_NULL,"-local_print",&flg);
 63:   if (flg) {
 64:     PetscViewer            sviewer;
 65:     ISLocalToGlobalMapping is;

 67:     PetscSynchronizedPrintf(PETSC_COMM_WORLD,"\nLocal Vector: processor %d\n",rank);
 68:     PetscViewerGetSingleton(PETSC_VIEWER_STDOUT_WORLD,&sviewer);
 69:     VecView(local,sviewer);
 70:     PetscViewerRestoreSingleton(PETSC_VIEWER_STDOUT_WORLD,&sviewer);
 71:     PetscSynchronizedFlush(PETSC_COMM_WORLD);

 73:     PetscSynchronizedPrintf(PETSC_COMM_WORLD,"\nLocal to global mapping: processor %d\n",rank);
 74:     PetscViewerGetSingleton(PETSC_VIEWER_STDOUT_WORLD,&sviewer);
 75:     DAGetISLocalToGlobalMapping(da,&is);
 76:     ISLocalToGlobalMappingView(is,sviewer);
 77:     PetscViewerRestoreSingleton(PETSC_VIEWER_STDOUT_WORLD,&sviewer);
 78:     PetscSynchronizedFlush(PETSC_COMM_WORLD);
 79:   }

 81:   /* Free memory */
 82:   PetscViewerDestroy(viewer);
 83:   VecDestroy(global);
 84:   VecDestroy(local);
 85:   DADestroy(da);
 86:   PetscFinalize();
 87:   return 0;
 88: }
 89: