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# MatFactorInvertSchurComplement
Invert the Schur complement matrix computed during the factorization step 
## Synopsis
```
#include "petscmat.h" 
PetscErrorCode MatFactorInvertSchurComplement(Mat F)
```
Logically Collective


## Input Parameter

- ***F -*** the factored matrix obtained by calling `MatGetFactor()`





## Notes
Must be called after `MatFactorSetSchurIS()`.

Call `MatFactorGetSchurComplement()` or  `MatFactorCreateSchurComplement()` AFTER this call to actually compute the inverse and get access to it.


## See Also
 [](ch_matrices), `Mat`, `MatGetFactor()`, `MatFactorSetSchurIS()`, `MatFactorGetSchurComplement()`, `MatFactorCreateSchurComplement()`

## Level
advanced

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/mat/interface/matrix.c.html#MatFactorInvertSchurComplement">src/mat/interface/matrix.c</A>


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