petsc-3.10.5 2019-03-28
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# PCFactorSetMatOrderingType

Sets the ordering routine (to reduce fill) to be used in the LU factorization.

### Synopsis

    #include "petscpc.h"
    PetscErrorCode  PCFactorSetMatOrderingType(PC pc,MatOrderingType ordering)

Logically Collective on PC

### Input Parameters

| pc | - the preconditioner context
| ordering | - the matrix ordering name, for example, MATORDERINGND or MATORDERINGRCM

### Options Database Key

-pc_factor_mat_ordering_type <nd,rcm,...> -Sets ordering routine

### Notes

nested dissection is used by default

For Cholesky and ICC and the SBAIJ format reorderings are not available, since only the upper triangular part of the matrix is stored. You can use the SeqAIJ format in this case to get reorderings.

### Level

intermediate

### Location

src/ksp/pc/impls/factor/factor.c

### Implementations

PCFactorSetMatOrderingType_Factor in src/ksp/pc/impls/factor/factimpl.c
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