Date: 2015-10-02T22:12:35+00:00

Actual source code: sp1wd.c
petsc-3.6.2 2015-10-02
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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: */
     10: PETSC_EXTERN PetscErrorCode MatGetOrdering_1WD(Mat mat,MatOrderingType type,IS *row,IS *col)
     11: {
     13:   PetscInt       i,*mask,*xls,nblks,*xblk,*ls,nrow,*perm;
     14:   const PetscInt *ia,*ja;
     15:   PetscBool      done;

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

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

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

     27:   ISCreateGeneral(PETSC_COMM_SELF,nrow,perm,PETSC_COPY_VALUES,row);
     28:   ISCreateGeneral(PETSC_COMM_SELF,nrow,perm,PETSC_COPY_VALUES,col);
     29:   PetscFree5(mask,xls,ls,xblk,perm);
     30:   return(0);
     31: }