Actual source code: ex2.c

  1: /*$Id: ex2.c,v 1.43 2001/08/07 03:04:42 balay Exp $*/

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

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

 10: int main(int argc,char **argv)
 11: {
 12:   int          rank,M = 13,ierr,w=1,s=1,wrap=1;
 13:   DA           da;
 14:   PetscViewer  viewer;
 15:   Vec          local,global;
 16:   PetscScalar  value;
 17:   PetscDraw    draw;
 18:   PetscTruth   flg;

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

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

 27:   /* Readoptions */
 28:   PetscOptionsGetInt(PETSC_NULL,"-M",&M,PETSC_NULL);
 29:   PetscOptionsGetInt(PETSC_NULL,"-w",&w,PETSC_NULL);
 30:   PetscOptionsGetInt(PETSC_NULL,"-s",&s,PETSC_NULL);

 32:   /* Create distributed array and get vectors */
 33:   DACreate1d(PETSC_COMM_WORLD,(DAPeriodicType)wrap,M,w,s,PETSC_NULL,&da);
 34:   DAView(da,viewer);
 35:   DACreateGlobalVector(da,&global);
 36:   DACreateLocalVector(da,&local);

 38:   /* Set global vector; send ghost points to local vectors */
 39:   value = 1;
 40:   VecSet(&value,global);
 41:   DAGlobalToLocalBegin(da,global,INSERT_VALUES,local);
 42:   DAGlobalToLocalEnd(da,global,INSERT_VALUES,local);

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

 50:   VecView(global,viewer);
 51:   PetscPrintf(PETSC_COMM_WORLD,"\nGlobal Vector:\n");
 52:   VecView(global,PETSC_VIEWER_STDOUT_WORLD);
 53:   PetscPrintf(PETSC_COMM_WORLD,"\n");

 55:   /* Send ghost points to local vectors */
 56:   DAGlobalToLocalBegin(da,global,INSERT_VALUES,local);
 57:   DAGlobalToLocalEnd(da,global,INSERT_VALUES,local);

 59:   PetscOptionsHasName(PETSC_NULL,"-local_print",&flg);
 60:   if (flg) {
 61:     PetscViewer sviewer;
 62:     PetscSynchronizedPrintf(PETSC_COMM_WORLD,"\nLocal Vector: processor %d\n",rank);
 63:     PetscViewerGetSingleton(PETSC_VIEWER_STDOUT_WORLD,&sviewer);
 64:     VecView(local,sviewer);
 65:     PetscViewerRestoreSingleton(PETSC_VIEWER_STDOUT_WORLD,&sviewer);
 66:     PetscSynchronizedFlush(PETSC_COMM_WORLD);
 67:   }

 69:   /* Free memory */
 70:   PetscViewerDestroy(viewer);
 71:   VecDestroy(global);
 72:   VecDestroy(local);
 73:   DADestroy(da);
 74:   PetscFinalize();
 75:   return 0;
 76: }
 77: