:orphan:
# SNESSetUpMatrices
ensures that matrices are available for `SNES` Newton-like methods, this is called by `SNESSetUp_XXX()` 
## Synopsis
```
#include "petscsnes.h"  
PetscErrorCode SNESSetUpMatrices(SNES snes)
```
Collective


## Input Parameter

- ***snes -*** `SNES` object to configure





## Note
If the matrices do not yet exist it attempts to create them based on options previously set for the `SNES` such as `-snes_mf`


## See Also
 [](ch_snes), `SNES`, `SNESSetUp()`

## Level
developer

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/snes/interface/snes.c.html#SNESSetUpMatrices">src/snes/interface/snes.c</A>


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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/snes/interface/snes.c)


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