:orphan:
# PCFactorSetReuseOrdering
When similar matrices are factored, this causes the ordering computed in the first factor to be used for all following factors.
## Synopsis
```
#include "petscpc.h"
PetscErrorCode PCFactorSetReuseOrdering(PC pc, PetscBool flag)
```
Logically Collective
## Input Parameters
- ***pc -*** the preconditioner context
- ***flag -*** `PETSC_TRUE` to reuse else `PETSC_FALSE`
## Options Database Key
- ***-pc_factor_reuse_ordering -*** Activate `PCFactorSetReuseOrdering()`
## See Also
`PCLU`, `PCCHOLESKY`, `PCFactorSetReuseFill()`
## Level
intermediate
## Location
src/ksp/pc/impls/factor/cholesky/cholesky.c
## Implementations
PCFactorSetReuseOrdering_Factor in src/ksp/pc/impls/factor/factor.c
---
[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/ksp/pc/impls/factor/cholesky/cholesky.c)
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