# PCDeflationGetPC
Returns the additional preconditioner M^{-1}. 
## Synopsis
```
#include "petscksp.h" 
PetscErrorCode PCDeflationGetPC(PC pc, PC *apc)
```
Not Collective


## Input Parameter

- ***pc  -*** the preconditioner context



## Output Parameter

- ***apc -*** additional preconditioner





## See Also
 `PCDEFLATION`, `PCDeflationGetCoarseKSP()`

## Level
advanced

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/pc/impls/deflation/deflation.c.html#PCDeflationGetPC">src/ksp/pc/impls/deflation/deflation.c</A>

## Implementations

<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/pc/impls/deflation/deflation.c.html#PCDeflationGetPC_Deflation">PCDeflationGetPC_Deflation in src/ksp/pc/impls/deflation/deflation.c</A><BR>


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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/ksp/pc/impls/deflation/deflation.c)


[Index of all PC routines](index.md)  
[Table of Contents for all manual pages](/docs/manualpages/index.md)  
[Index of all manual pages](/docs/manualpages/singleindex.md)  
