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# MatHtoolUsePermutation
Sets whether a `MATHTOOL` matrix should permute input (resp. output) vectors following its internal source (resp. target) permutation. 
## Synopsis
```
#include "petscmat.h" 
PETSC_EXTERN PetscErrorCode MatHtoolUsePermutation(Mat A, PetscBool use)
```

## Input Parameters

- ***A -*** hierarchical matrix
- ***use -*** Boolean value





## See Also
 [](ch_matrices), `Mat`, `MATHTOOL`, `MatHtoolGetPermutationSource()`, `MatHtoolGetPermutationTarget()`

## Level
advanced

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/mat/impls/htool/htool.cxx.html#MatHtoolUsePermutation">src/mat/impls/htool/htool.cxx</A>

## Implementations

<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/mat/impls/htool/htool.cxx.html#MatHtoolUsePermutation_Htool">MatHtoolUsePermutation_Htool in src/mat/impls/htool/htool.cxx</A><BR>


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


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