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: