# MatSTRUMPACKSetHSSAbsTol
Set STRUMPACK absolute tolerance for HSS compression 
## Synopsis
```
#include "petscmat.h" 
PetscErrorCode MatSTRUMPACKSetHSSAbsTol(Mat F, PetscReal atol)
```
Logically Collective on F


## Input Parameters

- ***F -*** the factored matrix obtained by calling `MatGetFactor()` from PETSc-STRUMPACK interface
- ***atol -*** absolute compression tolerance



## Options Database Key

- ***-mat_strumpack_hss_abs_tol <1e-*** 8>         - Absolute compression tolerance (None)





## References

- **** -*** STRUMPACK manual



## See Also
 `MatGetFactor()`

## Level
beginner

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

## Implementations

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