Actual source code: ex11.c
2: static char help[] = "Tests various 1-dimensional DA routines.\n\n";
4: #include petscda.h
8: int main(int argc,char **argv)
9: {
10: PetscInt M = 5,N = 4,dof=1,s=1,wrap=0,i,n,j,k,m,cnt;
12: DA da;
13: PetscViewer viewer;
14: Vec local,locala,global,coors;
15: PetscScalar *xy,*alocal;
16: PetscDraw draw;
17: char fname[16];
19: PetscInitialize(&argc,&argv,(char*)0,help);
21: /* Create viewers */
22: PetscViewerDrawOpen(PETSC_COMM_WORLD,0,"",PETSC_DECIDE,PETSC_DECIDE,600,200,&viewer);
23: PetscViewerDrawGetDraw(viewer,0,&draw);
24: PetscDrawSetDoubleBuffer(draw);
26: /* Read options */
27: PetscOptionsGetInt(PETSC_NULL,"-M",&M,PETSC_NULL);
28: PetscOptionsGetInt(PETSC_NULL,"-N",&N,PETSC_NULL);
29: PetscOptionsGetInt(PETSC_NULL,"-dof",&dof,PETSC_NULL);
30: PetscOptionsGetInt(PETSC_NULL,"-s",&s,PETSC_NULL);
31: PetscOptionsGetInt(PETSC_NULL,"-periodic",&wrap,PETSC_NULL);
33: /* Create distributed array and get vectors */
34: DACreate2d(PETSC_COMM_WORLD,(DAPeriodicType)wrap,DA_STENCIL_BOX,M,N,PETSC_DECIDE,
35: PETSC_DECIDE,dof,s,PETSC_NULL,PETSC_NULL,&da);
36: DASetUniformCoordinates(da,0.0,1.0,0.0,1.0,0.0,0.0);
37: for (i=0; i<dof; i++) {
38: sprintf(fname,"Field %d",(int)i);
39: DASetFieldName(da,i,fname);
40: }
42: DAView(da,viewer);
43: DACreateGlobalVector(da,&global);
44: DACreateLocalVector(da,&local);
45: DACreateLocalVector(da,&locala);
46: DAGetCoordinates(da,&coors);
47: VecGetArray(coors,&xy);
49: VecView(coors,PETSC_VIEWER_STDOUT_SELF);
51: /* Set values into local vectors */
52: VecGetArray(local,&alocal);
53: DAGetGhostCorners(da,0,0,0,&m,&n,0);
54: n = n/dof;
55: for (k=0; k<dof; k++) {
56: cnt = 0;
57: for (j=0; j<n; j++) {
58: for (i=0; i<m; i++) {
59: alocal[k+dof*cnt] = PetscSinScalar(2.0*PETSC_PI*(k+1)*xy[2*cnt]);
60: cnt++;
61: }
62: }
63: }
64: VecRestoreArray(local,&alocal);
65: VecRestoreArray(coors,&xy);
66: VecDestroy(coords);
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: