# MatSTRUMPACKSetHSSMinSepSize
Set STRUMPACK minimum separator size for low-rank approximation 
## Synopsis
```
#include "petscmat.h" 
PetscErrorCode MatSTRUMPACKSetHSSMinSepSize(Mat F, PetscInt hssminsize)
```
Logically Collective on F


## Input Parameters

- ***F -*** the factored matrix obtained by calling `MatGetFactor()` from PETSc-STRUMPACK interface
- ***hssminsize -*** minimum dense matrix size for low-rank approximation



## Options Database Key

- ***-mat_strumpack_hss_min_sep_size <hssminsize> -*** set the minimum separator size





## 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#MatSTRUMPACKSetHSSMinSepSize">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.html</A><BR>

## Implementations

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