:orphan:
# MatFactorInfo
Data passed into the matrix factorization routines, and information about the resulting factorization 
## Synopsis
```
typedef struct {
  PetscReal diagonal_fill; /* force diagonal to fill in if initially not filled */
  PetscReal usedt;
  PetscReal dt;            /* drop tolerance */
  PetscReal dtcol;         /* tolerance for pivoting */
  PetscReal dtcount;       /* maximum nonzeros to be allowed per row */
  PetscReal fill;          /* expected fill, nonzeros in factored matrix/nonzeros in original matrix */
  PetscReal levels;        /* ICC/ILU(levels) */
  PetscReal pivotinblocks; /* for BAIJ and SBAIJ matrices pivot in factorization on blocks, default 1.0
                                   factorization may be faster if do not pivot */
  PetscReal zeropivot;     /* pivot is called zero if less than this */
  PetscReal shifttype;     /* type of shift added to matrix factor to prevent zero pivots */
  PetscReal shiftamount;   /* how large the shift is */
} MatFactorInfo;
```



## Note
You can use `MatFactorInfoInitialize()` to set default values.


## Fortran Note
The data is available in a double precision arrays of size `MAT_FACTORINFO_SIZE`


## See Also
 [](ch_matrices), `Mat`, `MatInfo`, `MatGetFactor()`, `MatLUFactorSymbolic()`, `MatILUFactorSymbolic()`, `MatCholeskyFactorSymbolic()`,
`MatICCFactorSymbolic()`, `MatICCFactor()`, `MatFactorInfoInitialize()`

## Level
developer

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/include/petscmat.h.html#MatFactorInfo">include/petscmat.h</A>


---
[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/include/petscmat.h)


[Index of all Mat routines](index.md)  
[Table of Contents for all manual pages](/manualpages/index.md)  
[Index of all manual pages](/manualpages/singleindex.md)