# PCDeflationSetCoarseMat
Set the coarse problem `Mat`. 
## Synopsis
```
#include "petscksp.h" 
PetscErrorCode PCDeflationSetCoarseMat(PC pc, Mat mat)
```
Collective


## Input Parameters

- ***pc  -*** preconditioner context
- ***mat -*** coarse problem mat





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

## Level
developer

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

## Implementations

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


---
[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)  
