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# MatSTRUMPACKSetHSSRelTol
Set STRUMPACK relative tolerance for HSS compression 
## Synopsis
```
#include "petscmat.h" 
PetscErrorCode MatSTRUMPACKSetHSSRelTol(Mat F, PetscReal rtol)
```
Logically Collective


## Input Parameters

- ***F -*** the factored matrix obtained by calling `MatGetFactor()`
- ***rtol -*** relative compression tolerance



## Options Database Key

- ***-mat_strumpack_hss_rel_tol <1e-*** 2>         - Relative compression tolerance (None)





## References

- **** -*** STRUMPACK manual



## See Also
 [](ch_matrices), `Mat`, `MatGetFactor()`, `MatSTRUMPACKSetReordering()`, `MatSTRUMPACKSetColPerm()`, `MatSTRUMPACKSetHSSAbsTol()`,
`MatSTRUMPACKSetHSSMaxRank()`, `MatSTRUMPACKSetHSSLeafSize()`, `MatSTRUMPACKSetHSSMinSepSize()`

## Level
beginner

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/mat/impls/aij/mpi/strumpack/strumpack.c.html#MatSTRUMPACKSetHSSRelTol">src/mat/impls/aij/mpi/strumpack/strumpack.c</A>

## Examples
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/ksp/tutorials/ex52.c.html">src/ksp/ksp/tutorials/ex52.c</A><BR>

## Implementations

<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/mat/impls/aij/mpi/strumpack/strumpack.c.html#MatSTRUMPACKSetHSSRelTol_STRUMPACK">MatSTRUMPACKSetHSSRelTol_STRUMPACK in src/mat/impls/aij/mpi/strumpack/strumpack.c</A><BR>


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


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