:orphan:
# MatInfo
Context of matrix information, used with `MatGetInfo()` 
## Synopsis
```
typedef struct {
  PetscLogDouble block_size;                          /* block size */
  PetscLogDouble nz_allocated, nz_used, nz_unneeded;  /* number of nonzeros */
  PetscLogDouble memory;                              /* memory allocated */
  PetscLogDouble assemblies;                          /* number of matrix assemblies called */
  PetscLogDouble mallocs;                             /* number of mallocs during MatSetValues() */
  PetscLogDouble fill_ratio_given, fill_ratio_needed; /* fill ratio for LU/ILU */
  PetscLogDouble factor_mallocs;                      /* number of mallocs during factorization */
} MatInfo;
```



## Fortran Note
Information is stored as a double-precision array of dimension `MAT_INFO_SIZE`


## See Also
 [](ch_matrices), `Mat`, `MatGetInfo()`, `MatInfoType`

## Level
intermediate

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


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