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# KSPFETIDPSetInnerBDDC
Provides the `PCBDDC` preconditioner used to set up the `KSPFETIDP` matrix for the Lagrange multipliers 
## Synopsis
```
#include <petscksp.h> 
PetscErrorCode KSPFETIDPSetInnerBDDC(KSP ksp, PC pc)
```
Collective


## Input Parameters

- ***ksp -*** the `KSPFETIDP` Krylov solver
- ***pc -*** the `PCBDDC` preconditioner





## Note
A `PC` is automatically created for the `KSPFETIDP` and can be accessed to change options with  `KSPFETIDPGetInnerBDDC()` hence this routine is rarely needed


## See Also
 [](ch_ksp), `MATIS`, `PCBDDC`, `KSPFETIDPGetInnerBDDC()`, `KSPFETIDPGetInnerKSP()`

## Level
advanced

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/ksp/impls/fetidp/fetidp.c.html#KSPFETIDPSetInnerBDDC">src/ksp/ksp/impls/fetidp/fetidp.c</A>

## Examples
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/ksp/tutorials/ex59.c.html">src/ksp/ksp/tutorials/ex59.c</A><BR>

## Implementations

<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/ksp/impls/fetidp/fetidp.c.html#KSPFETIDPSetInnerBDDC_FETIDP">KSPFETIDPSetInnerBDDC_FETIDP in src/ksp/ksp/impls/fetidp/fetidp.c</A><BR>


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


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