Actual source code: sp1wd.c
2: #include <petscmat.h>
3: #include <petsc/private/matorderimpl.h>
5: /*
6: MatGetOrdering_1WD - Find the 1-way dissection ordering of a given matrix.
7: */
8: PETSC_INTERN PetscErrorCode MatGetOrdering_1WD(Mat mat, MatOrderingType type, IS *row, IS *col)
9: {
10: PetscInt i, *mask, *xls, nblks, *xblk, *ls, nrow, *perm;
11: const PetscInt *ia, *ja;
12: PetscBool done;
14: MatGetRowIJ(mat, 1, PETSC_TRUE, PETSC_TRUE, &nrow, &ia, &ja, &done);
17: PetscMalloc5(nrow, &mask, nrow + 1, &xls, nrow, &ls, nrow + 1, &xblk, nrow, &perm);
18: SPARSEPACKgen1wd(&nrow, ia, ja, mask, &nblks, xblk, perm, xls, ls);
19: MatRestoreRowIJ(mat, 1, PETSC_TRUE, PETSC_TRUE, NULL, &ia, &ja, &done);
21: for (i = 0; i < nrow; i++) perm[i]--;
23: ISCreateGeneral(PETSC_COMM_SELF, nrow, perm, PETSC_COPY_VALUES, row);
24: ISCreateGeneral(PETSC_COMM_SELF, nrow, perm, PETSC_COPY_VALUES, col);
25: PetscFree5(mask, xls, ls, xblk, perm);
26: return 0;
27: }