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# PCFieldSplitGetSchurPre
For Schur complement fieldsplit, determine how the Schur complement will be preconditioned.  See `PCFieldSplitSetSchurPre()` for details. 
## Synopsis
```
#include "petscpc.h" 
PetscErrorCode PCFieldSplitGetSchurPre(PC pc, PCFieldSplitSchurPreType *ptype, Mat *pre)
```
Logically Collective


## Input Parameter

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



## Output Parameters

- ***ptype   -*** which matrix to use for preconditioning the Schur complement: `PC_FIELDSPLIT_SCHUR_PRE_A11`, `PC_FIELDSPLIT_SCHUR_PRE_SELF`, `PC_FIELDSPLIT_PRE_USER`
- ***pre -*** matrix to use for preconditioning (with `PC_FIELDSPLIT_PRE_USER`), or NULL





## See Also
 [](sec_block_matrices), `PC`, `PCFieldSplitSetSchurPre()`, `PCFieldSplitGetSubKSP()`, `PCFIELDSPLIT`, `PCFieldSplitSetFields()`, `PCFieldSplitSchurPreType`, `PCLSC`,
`PCFieldSplitSchurPreType`

## Level
intermediate

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

## Implementations

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


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


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