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