1: /*$Id: ex1.c,v 1.16 2001/08/07 03:04:45 balay Exp $*/

  3: static char help[] = "Tests VecView() contour plotting for 2d DAs.nn";

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

  8: #undef __FUNCT__
 10: int main(int argc,char **argv)
 11: {
 12:   int            rank,M = 10,N = 8,m = PETSC_DECIDE,n = PETSC_DECIDE,ierr;
 13:   PetscTruth     flg;
 14:   DA             da;
 15:   PetscViewer    viewer;
 16:   Vec            local,global;
 17:   PetscScalar    value;
 18:   DAPeriodicType ptype = DA_NONPERIODIC;
 19:   DAStencilType  stype = DA_STENCIL_BOX;

 21:   PetscInitialize(&argc,&argv,(char*)0,help);
 22:   PetscViewerDrawOpen(PETSC_COMM_WORLD,0,"",300,0,300,300,&viewer);

 24:   /* Read options */
 25:   PetscOptionsGetInt(PETSC_NULL,"-M",&M,PETSC_NULL);
 26:   PetscOptionsGetInt(PETSC_NULL,"-N",&N,PETSC_NULL);
 27:   PetscOptionsGetInt(PETSC_NULL,"-m",&m,PETSC_NULL);
 28:   PetscOptionsGetInt(PETSC_NULL,"-n",&n,PETSC_NULL);
 29:   PetscOptionsHasName(PETSC_NULL,"-star_stencil",&flg);
 30:   if (flg) stype = DA_STENCIL_STAR;

 32:   /* Create distributed array and get vectors */
 33:   DACreate2d(PETSC_COMM_WORLD,ptype,stype,
 34:                     M,N,m,n,1,1,PETSC_NULL,PETSC_NULL,&da);
 35:   DACreateGlobalVector(da,&global);
 36:   DACreateLocalVector(da,&local);

 38:   value = -3.0;
 39:   VecSet(&value,global);
 40:   DAGlobalToLocalBegin(da,global,INSERT_VALUES,local);
 41:   DAGlobalToLocalEnd(da,global,INSERT_VALUES,local);

 43:   MPI_Comm_rank(PETSC_COMM_WORLD,&rank);
 44:   value = rank+1;
 45:   VecScale(&value,local);
 46:   DALocalToGlobal(da,local,ADD_VALUES,global);

 48:   DAView(da,viewer);
 49:   VecView(global,viewer);

 51:   /* Free memory */
 52:   PetscViewerDestroy(viewer);
 53:   VecDestroy(local);
 54:   VecDestroy(global);
 55:   DADestroy(da);
 56:   PetscFinalize();
 57:   return 0;
 58: }
 59: