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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
src/ksp/pc/impls/is/pcis.c
## Implementations
PCISSetUseStiffnessScaling_IS in src/ksp/pc/impls/is/pcis.c
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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)