Actual source code: ex14.c

  2: static char help[] = "Tests saving DA vectors to files.\n\n";

 4:  #include petscda.h

  8: int main(int argc,char **argv)
  9: {
 10:   PetscMPIInt    rank;
 11:   PetscInt       M = 10,N = 8,m = PETSC_DECIDE,n = PETSC_DECIDE, dof = 1;
 13:   DA             da;
 14:   Vec            local,global,natural;
 15:   PetscScalar    value;
 16:   PetscViewer    bviewer;

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

 20:   /* Read options */
 21:   PetscOptionsGetInt(PETSC_NULL,"-M",&M,PETSC_NULL);
 22:   PetscOptionsGetInt(PETSC_NULL,"-N",&N,PETSC_NULL);
 23:   PetscOptionsGetInt(PETSC_NULL,"-m",&m,PETSC_NULL);
 24:   PetscOptionsGetInt(PETSC_NULL,"-n",&n,PETSC_NULL);
 25:   PetscOptionsGetInt(PETSC_NULL,"-dof",&dof,PETSC_NULL);

 27:   /* Create distributed array and get vectors */
 28:   DACreate2d(PETSC_COMM_WORLD,DA_NONPERIODIC,DA_STENCIL_BOX,
 29:                     M,N,m,n,dof,1,PETSC_NULL,PETSC_NULL,&da);
 30:   DACreateGlobalVector(da,&global);
 31:   DACreateLocalVector(da,&local);

 33:   value = -3.0;
 34:   VecSet(global,value);
 35:   DAGlobalToLocalBegin(da,global,INSERT_VALUES,local);
 36:   DAGlobalToLocalEnd(da,global,INSERT_VALUES,local);

 38:   MPI_Comm_rank(PETSC_COMM_WORLD,&rank);
 39:   value = rank+1;
 40:   VecScale(local,value);
 41:   DALocalToGlobal(da,local,ADD_VALUES,global);

 43:   DACreateNaturalVector(da,&natural);
 44:   DAGlobalToNaturalBegin(da,global,INSERT_VALUES,natural);
 45:   DAGlobalToNaturalEnd(da,global,INSERT_VALUES,natural);

 47:   DASetFieldName(da,0,"First field");
 48:   /*  VecView(global,PETSC_VIEWER_DRAW_WORLD); */

 50:   PetscViewerBinaryOpen(PETSC_COMM_WORLD,"daoutput",FILE_MODE_WRITE,&bviewer);
 51:   DAView(da,bviewer);
 52:   VecView(global,bviewer);
 53:   PetscViewerDestroy(bviewer);

 55:   /* Free memory */
 56:   VecDestroy(local);
 57:   VecDestroy(global);
 58:   VecDestroy(natural);
 59:   DADestroy(da);
 60:   PetscFinalize();
 61:   return 0;
 62: }
 63: