Actual source code: sp1wd.c
1: #define PETSCMAT_DLL
3: #include petscmat.h
4: #include ../src/mat/order/order.h
7: /*
8: MatOrdering_1WD - Find the 1-way dissection ordering of a given matrix.
9: */
12: PetscErrorCode MatOrdering_1WD(Mat mat,const MatOrderingType type,IS *row,IS *col)
13: {
15: PetscInt i,*mask,*xls,nblks,*xblk,*ls,nrow,*perm,*ia,*ja;
16: PetscTruth done;
19: MatGetRowIJ(mat,1,PETSC_TRUE,PETSC_TRUE,&nrow,&ia,&ja,&done);
20: if (!done) SETERRQ(PETSC_ERR_SUP,"Cannot get rows for matrix");
22: PetscMalloc5(nrow,PetscInt,&mask,nrow+1,PetscInt,&xls,nrow,PetscInt,&ls,nrow+1,PetscInt,&xblk,nrow,PetscInt,&perm);
23: SPARSEPACKgen1wd(&nrow,ia,ja,mask,&nblks,xblk,perm,xls,ls);
24: MatRestoreRowIJ(mat,1,PETSC_TRUE,PETSC_TRUE,&nrow,&ia,&ja,&done);
26: for (i=0; i<nrow; i++) perm[i]--;
28: ISCreateGeneral(PETSC_COMM_SELF,nrow,perm,row);
29: ISCreateGeneral(PETSC_COMM_SELF,nrow,perm,col);
30: PetscFree5(mask,xls,ls,xblk,perm);
31: return(0);
32: }