Actual source code: sp1wd.c
petsc-3.10.5 2019-03-28
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      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: {
     11:   PetscInt       i,*mask,*xls,nblks,*xblk,*ls,nrow,*perm;
     12:   const PetscInt *ia,*ja;
     13:   PetscBool      done;

     16:   MatGetRowIJ(mat,1,PETSC_TRUE,PETSC_TRUE,&nrow,&ia,&ja,&done);
     17:   if (!done) SETERRQ(PetscObjectComm((PetscObject)mat),PETSC_ERR_SUP,"Cannot get rows for matrix");

     19:   PetscMalloc5(nrow,&mask,nrow+1,&xls,nrow,&ls,nrow+1,&xblk,nrow,&perm);
     20:   SPARSEPACKgen1wd(&nrow,ia,ja,mask,&nblks,xblk,perm,xls,ls);
     21:   MatRestoreRowIJ(mat,1,PETSC_TRUE,PETSC_TRUE,NULL,&ia,&ja,&done);

     23:   for (i=0; i<nrow; i++) perm[i]--;

     25:   ISCreateGeneral(PETSC_COMM_SELF,nrow,perm,PETSC_COPY_VALUES,row);
     26:   ISCreateGeneral(PETSC_COMM_SELF,nrow,perm,PETSC_COPY_VALUES,col);
     27:   PetscFree5(mask,xls,ls,xblk,perm);
     28:   return(0);
     29: }