Actual source code: ex10.c
2: static char help[] = "Tests ISFilter().\n\n";
4: #include <petscis.h>
5: #include <petscviewer.h>
7: static PetscErrorCode CreateIS(MPI_Comm comm, PetscInt n, PetscInt first, PetscInt step, IS *is)
8: {
9: PetscInt *idx, i, j;
10: PetscMPIInt rank;
12: MPI_Comm_rank(comm, &rank);
13: *is = NULL;
14: first += rank;
15: PetscMalloc1(n, &idx);
16: for (i = 0, j = first; i < n; i++, j += step) idx[i] = j;
17: ISCreateGeneral(comm, n, idx, PETSC_OWN_POINTER, is);
18: return 0;
19: }
21: int main(int argc, char **argv)
22: {
23: IS is;
24: PetscInt n = 10, N, first = 0, step = 0, start, end;
25: PetscMPIInt rank;
26: MPI_Comm comm;
29: PetscInitialize(&argc, &argv, (char *)0, help);
30: comm = PETSC_COMM_WORLD;
31: MPI_Comm_rank(comm, &rank);
32: PetscOptionsGetInt(NULL, NULL, "-n", &n, NULL);
33: PetscOptionsGetInt(NULL, NULL, "-first", &first, NULL);
34: PetscOptionsGetInt(NULL, NULL, "-step", &step, NULL);
35: start = 0;
36: end = n;
37: PetscOptionsGetInt(NULL, NULL, "-start", &start, NULL);
38: PetscOptionsGetInt(NULL, NULL, "-end", &end, NULL);
40: CreateIS(comm, n, first, step, &is);
41: ISGeneralFilter(is, start, end);
42: ISView(is, PETSC_VIEWER_STDOUT_(comm));
43: ISGetSize(is, &N);
44: PetscViewerASCIIPrintf(PETSC_VIEWER_STDOUT_(comm), "global size: %" PetscInt_FMT "\n", N);
46: ISDestroy(&is);
47: PetscFinalize();
48: return 0;
49: }
51: /*TEST
53: test:
54: suffix: 1
55: nsize: 4
56: args: -n 6
57: args: -first -2
58: args: -step 1
59: args: -start {{-2 4}separate output} -end {{2 6}separate output}
61: TEST*/