Actual source code: ex11.c
2: static char help[] = "Tests various 1-dimensional DA routines.\n\n";
4: #include petscda.h
5: #include petscsys.h
9: int main(int argc,char **argv)
10: {
11: PetscInt M = 5,N = 4,dof=1,s=1,wrap=0,i,n,j,k,m,cnt;
13: DA da;
14: PetscViewer viewer;
15: Vec local,locala,global,coors;
16: PetscScalar *xy,*alocal;
17: PetscDraw draw;
18: char fname[16];
20: PetscInitialize(&argc,&argv,(char*)0,help);
22: /* Create viewers */
23: PetscViewerDrawOpen(PETSC_COMM_WORLD,0,"",PETSC_DECIDE,PETSC_DECIDE,600,200,&viewer);
24: PetscViewerDrawGetDraw(viewer,0,&draw);
25: PetscDrawSetDoubleBuffer(draw);
27: /* Read options */
28: PetscOptionsGetInt(PETSC_NULL,"-M",&M,PETSC_NULL);
29: PetscOptionsGetInt(PETSC_NULL,"-N",&N,PETSC_NULL);
30: PetscOptionsGetInt(PETSC_NULL,"-dof",&dof,PETSC_NULL);
31: PetscOptionsGetInt(PETSC_NULL,"-s",&s,PETSC_NULL);
32: PetscOptionsGetInt(PETSC_NULL,"-periodic",&wrap,PETSC_NULL);
34: /* Create distributed array and get vectors */
35: DACreate2d(PETSC_COMM_WORLD,(DAPeriodicType)wrap,DA_STENCIL_BOX,M,N,PETSC_DECIDE,
36: PETSC_DECIDE,dof,s,PETSC_NULL,PETSC_NULL,&da);
37: DASetUniformCoordinates(da,0.0,1.0,0.0,1.0,0.0,0.0);
38: for (i=0; i<dof; i++) {
39: sprintf(fname,"Field %d",(int)i);
40: DASetFieldName(da,i,fname);
41: }
43: DAView(da,viewer);
44: DACreateGlobalVector(da,&global);
45: DACreateLocalVector(da,&local);
46: DACreateLocalVector(da,&locala);
47: DAGetCoordinates(da,&coors);
48: VecGetArray(coors,&xy);
50: VecView(coors,PETSC_VIEWER_STDOUT_SELF);
52: /* Set values into local vectors */
53: VecGetArray(local,&alocal);
54: DAGetGhostCorners(da,0,0,0,&m,&n,0);
55: n = n/dof;
56: for (k=0; k<dof; k++) {
57: cnt = 0;
58: for (j=0; j<n; j++) {
59: for (i=0; i<m; i++) {
60: alocal[k+dof*cnt] = PetscSinScalar(2.0*PETSC_PI*(k+1)*xy[2*cnt]);
61: cnt++;
62: }
63: }
64: }
65: VecRestoreArray(local,&alocal);
66: VecRestoreArray(coors,&xy);
68: DALocalToGlobal(da,local,INSERT_VALUES,global);
70: VecView(global,viewer);
72: /* Send ghost points to local vectors */
73: DAGlobalToLocalBegin(da,global,INSERT_VALUES,locala);
74: DAGlobalToLocalEnd(da,global,INSERT_VALUES,locala);
76: /* Free memory */
77: PetscViewerDestroy(viewer);
78: VecDestroy(global);
79: VecDestroy(local);
80: VecDestroy(locala);
81: DADestroy(da);
82: PetscFinalize();
83: return 0;
84: }
85: