:orphan:
# PCMAT
A preconditioner obtained by multiplying by the preconditioner matrix supplied in `PCSetOperators()` or `KSPSetOperators()` 
## Note
This one is a little strange. One rarely has an explicit matrix that approximates the
inverse of the matrix they wish to solve for.




## See Also
 `PCCreate()`, `PCSetType()`, `PCType`, `PC`,
`PCSHELL`

## Level
intermediate

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/pc/impls/mat/pcmat.c.html#PCMAT">src/ksp/pc/impls/mat/pcmat.c</A>


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


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