# PCFieldSplitSchurPreType
Determines how to precondition a Schur complement 
## Synopsis
```
typedef enum {
  PC_FIELDSPLIT_SCHUR_PRE_SELF,
  PC_FIELDSPLIT_SCHUR_PRE_SELFP,
  PC_FIELDSPLIT_SCHUR_PRE_A11,
  PC_FIELDSPLIT_SCHUR_PRE_USER,
  PC_FIELDSPLIT_SCHUR_PRE_FULL
} PCFieldSplitSchurPreType;
```



## See Also
 [](sec_pc), `PCFIELDSPLIT`, `PCFieldSplitSetSchurPre()`, `PC`

## Level
intermediate

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/include/petscpctypes.h.html#PCFieldSplitSchurPreType">include/petscpctypes.h</A>

## Examples
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/dm/impls/stag/tutorials/ex4.c.html">src/dm/impls/stag/tutorials/ex4.c.html</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/snes/tutorials/ex70.c.html">src/snes/tutorials/ex70.c.html</A><BR>


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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/include/petscpctypes.h)


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