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# MatSuperluSetILUDropTol
Set SuperLU ILU drop tolerance 
## Synopsis
```
#include "petscmat.h" 
PetscErrorCode MatSuperluSetILUDropTol(Mat F, PetscReal dtol)
```
Logically Collective


## Input Parameters

- ***F -*** the factored matrix obtained by calling `MatGetFactor()`
- ***dtol -*** drop tolerance



## Options Database Key

- ***-mat_superlu_ilu_droptol <dtol> -*** the drop tolerance





## References

- **** -*** SuperLU Users' Guide



## See Also
 [](ch_matrices), `Mat`, `MatGetFactor()`, `MATSOLVERSUPERLU`

## Level
beginner

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/mat/impls/aij/seq/superlu/superlu.c.html#MatSuperluSetILUDropTol">src/mat/impls/aij/seq/superlu/superlu.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/seq/superlu/superlu.c.html#MatSuperluSetILUDropTol_SuperLU">MatSuperluSetILUDropTol_SuperLU in src/mat/impls/aij/seq/superlu/superlu.c</A><BR>


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


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