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# PCISSetUseStiffnessScaling
Tells `PCIS` to construct partition of unity using the local matrices' diagonal entries 
## Synopsis
```
#include "petscpc.h" 
PetscErrorCode PCISSetUseStiffnessScaling(PC pc, PetscBool use)
```
Logically Collective


## Input Parameters

- ***pc -*** the preconditioning context
- ***use -*** whether or not it should use matrix diagonal to build partition of unity.





## Developer Note
There is no manual page for `PCIS` nor some of its methods


## See Also
 `PCIS`, `PCBDDC`

## Level
intermediate

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/pc/impls/is/pcis.c.html#PCISSetUseStiffnessScaling">src/ksp/pc/impls/is/pcis.c</A>

## Implementations

<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/pc/impls/is/pcis.c.html#PCISSetUseStiffnessScaling_IS">PCISSetUseStiffnessScaling_IS in src/ksp/pc/impls/is/pcis.c</A><BR>


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