# MatPartitioningChacoSetEigenTol
Sets the tolerance for the eigensolver used by Chaco 
## Synopsis
```
#include "petscmat.h" 
PetscErrorCode MatPartitioningChacoSetEigenTol(MatPartitioning part, PetscReal tol)
```
Collective on MatPartitioning


## Input Parameters

- ***part -*** the partitioning context
- ***tol  -*** the tolerance



## Options Database Key

- ***-mat_partitioning_chaco_eigen_tol <tol> -*** Tolerance for eigensolver



## Note
Must be positive. The default value is 0.001.




## See Also
 `MatPartitioningType`, `MatPartitioning`, `MATPARTITIONINGCHACO`, `MatPartitioningChacoSetEigenSolver()`, `MatPartitioningChacoGetEigenTol()`

## Level
advanced

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/mat/partition/impls/chaco/chaco.c.html#MatPartitioningChacoSetEigenTol">src/mat/partition/impls/chaco/chaco.c</A>

## Implementations

<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/mat/partition/impls/chaco/chaco.c.html#MatPartitioningChacoSetEigenTol_Chaco">MatPartitioningChacoSetEigenTol_Chaco in src/mat/partition/impls/chaco/chaco.c</A><BR>


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


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