Actual source code: ex37.c
2: static char help[] = "VecView() with a DMDA1d vector and draw viewer.\n\n";
4: #include <petscdm.h>
5: #include <petscdmda.h>
6: #include <petscao.h>
8: PetscErrorCode apply(void *ctx, PetscInt n, const PetscScalar *x, PetscScalar *y)
9: {
10: PetscInt i;
12: for (i = 0; i < n; i++) {
13: y[3 * i] = x[i];
14: y[3 * i + 1] = x[i] * x[i];
15: y[3 * i + 2] = x[i] * x[i] * x[i];
16: }
17: return PETSC_SUCCESS;
18: }
20: int main(int argc, char **argv)
21: {
22: DM da;
23: Vec global;
24: PF pf;
26: PetscFunctionBeginUser;
27: PetscCall(PetscInitialize(&argc, &argv, (char *)0, help));
28: PetscCall(DMDACreate1d(PETSC_COMM_WORLD, DM_BOUNDARY_NONE, 10, 3, 1, NULL, &da));
29: PetscCall(DMSetFromOptions(da));
30: PetscCall(DMSetUp(da));
31: PetscCall(DMCreateGlobalVector(da, &global));
32: PetscCall(PFCreate(PETSC_COMM_WORLD, 1, 3, &pf));
33: PetscCall(PFSet(pf, apply, NULL, NULL, NULL, NULL));
34: PetscCall(PFApplyVec(pf, NULL, global));
35: PetscCall(PFDestroy(&pf));
36: PetscCall(VecView(global, PETSC_VIEWER_DRAW_WORLD));
37: PetscCall(VecDestroy(&global));
38: PetscCall(DMDestroy(&da));
39: PetscCall(PetscFinalize());
40: return 0;
41: }
43: /*TEST
45: test:
46: nsize: 2
47: requires: x
49: TEST*/