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# PCLMVMSetIS
Sets the index sets that reduce the `PC` application. 
## Synopsis
```
#include "petscpc.h" 
PetscErrorCode PCLMVMSetIS(PC pc, IS inactive)
```

## Input Parameters

- ***pc -*** An `PCLMVM` preconditioner
- ***inactive -*** Index set defining the variables removed from the problem





## Developer Note
Need to explain the purpose of this `IS`


## See Also
 `PCLMVM`, `MatLMVMUpdate()`

## Level
intermediate

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/pc/impls/lmvm/lmvmpc.c.html#PCLMVMSetIS">src/ksp/pc/impls/lmvm/lmvmpc.c</A>


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