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# SNESSetApplicationContext
Sets the optional user-defined context for the nonlinear solvers. 
## Synopsis
```
#include "petscsnes.h"  
PetscErrorCode SNESSetApplicationContext(SNES snes, void *usrP)
```
Logically Collective


## Input Parameters

- ***snes -*** the `SNES` context
- ***usrP -*** optional user context





## Notes
Users can provide a context when constructing the `SNES` options and then access it inside their function, Jacobian, or other evaluation function
with `SNESGetApplicationContext()`

To provide a function that computes the context for you use `SNESSetComputeApplicationContext()`


## Fortran Note
You must write a Fortran interface definition for this
function that tells Fortran the Fortran derived data type that you are passing in as the ctx argument.


## See Also
 [](ch_snes), `SNES`, `SNESSetComputeApplicationContext()`, `SNESGetApplicationContext()`

## Level
intermediate

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

## Examples
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/snes/tutorials/ex5f90.F90.html">src/snes/tutorials/ex5f90.F90</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/snes/tutorials/ex5f90t.F90.html">src/snes/tutorials/ex5f90t.F90</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/snes/tutorials/ex73f90t.F90.html">src/snes/tutorials/ex73f90t.F90</A><BR>


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[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)