# PCILUSetReuseOrdering

When similar matrices are factored, this causes the ordering computed in the first factor to be used for all following factors; applies to both fill and drop tolerance ILUs.

### Synopsis

    #include "petscpc.h"
    PetscErrorCode PETSCKSP_DLLEXPORT PCILUSetReuseOrdering(PC pc,PetscTruth flag)

Collective on PC

### Input Parameters

| pc | - the preconditioner context
| flag | - PETSC_TRUE to reuse else PETSC_FALSE

### Options Database Key

-pc_ilu_reuse_ordering -Activate PCILUSetReuseOrdering()

### Keywords

PC, levels, reordering, factorization, incomplete, ILU

### See Also

PCILUDTSetReuseFill(), PCLUSetReuseOrdering(), PCLUSetReuseFill()

Level:intermediate
Location:src/ksp/pc/impls/factor/ilu/ilu.c
Index of all PC routines
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Index of all manual pages