Actual source code: ex1.c

  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: int main(int argc,char **argv)
  9: {
 10:   int            rank,M = 10,N = 8,m = PETSC_DECIDE,n = PETSC_DECIDE,ierr;
 11:   PetscTruth     flg;
 12:   DA             da;
 13:   PetscViewer    viewer;
 14:   Vec            local,global;
 15:   PetscScalar    value;
 16:   DAPeriodicType ptype = DA_NONPERIODIC;
 17:   DAStencilType  stype = DA_STENCIL_BOX;

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

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

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

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

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

 46:   DAView(da,viewer);
 47:   VecView(global,viewer);

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