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.\n\n";

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

 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;
 20: #if defined(PETSC_HAVE_MATLAB) && !defined(PETSC_USE_COMPLEX) && !defined(PETSC_USE_SINGLE)
 21:   PetscViewer    mviewer;
 22: #endif

 24:   PetscInitialize(&argc,&argv,(char*)0,help);
 25:   PetscViewerDrawOpen(PETSC_COMM_WORLD,0,"",300,0,300,300,&viewer);
 26: #if defined(PETSC_HAVE_MATLAB) && !defined(PETSC_USE_COMPLEX) && !defined(PETSC_USE_SINGLE)
 27:   PetscViewerMatlabOpen(PETSC_COMM_WORLD,"tmp.mat",PETSC_FILE_CREATE,&mviewer);
 28: #endif

 30:   /* Read options */
 31:   PetscOptionsGetInt(PETSC_NULL,"-M",&M,PETSC_NULL);
 32:   PetscOptionsGetInt(PETSC_NULL,"-N",&N,PETSC_NULL);
 33:   PetscOptionsGetInt(PETSC_NULL,"-m",&m,PETSC_NULL);
 34:   PetscOptionsGetInt(PETSC_NULL,"-n",&n,PETSC_NULL);
 35:   PetscOptionsHasName(PETSC_NULL,"-star_stencil",&flg);
 36:   if (flg) stype = DA_STENCIL_STAR;

 38:   /* Create distributed array and get vectors */
 39:   DACreate2d(PETSC_COMM_WORLD,ptype,stype,M,N,m,n,1,1,PETSC_NULL,PETSC_NULL,&da);
 40:   DACreateGlobalVector(da,&global);
 41:   DACreateLocalVector(da,&local);

 43:   value = -3.0;
 44:   VecSet(&value,global);
 45:   DAGlobalToLocalBegin(da,global,INSERT_VALUES,local);
 46:   DAGlobalToLocalEnd(da,global,INSERT_VALUES,local);

 48:   MPI_Comm_rank(PETSC_COMM_WORLD,&rank);
 49:   value = rank+1;
 50:   VecScale(&value,local);
 51:   DALocalToGlobal(da,local,ADD_VALUES,global);

 53:   DAView(da,viewer);
 54:   VecView(global,viewer);
 55: #if defined(PETSC_HAVE_MATLAB) && !defined(PETSC_USE_COMPLEX) && !defined(PETSC_USE_SINGLE)
 56:   DAView(da,mviewer);
 57:   VecView(global,mviewer);
 58: #endif

 60:   /* Free memory */
 61: #if defined(PETSC_HAVE_MATLAB) && !defined(PETSC_USE_COMPLEX) && !defined(PETSC_USE_SINGLE)
 62:   PetscViewerDestroy(mviewer);
 63: #endif
 64:   PetscViewerDestroy(viewer);
 65:   VecDestroy(local);
 66:   VecDestroy(global);
 67:   DADestroy(da);
 68:   PetscFinalize();
 69:   return 0;
 70: }
 71: