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# KSPSetApplicationContext
Sets the optional user-defined context for the linear solver. 
## Synopsis
```
#include "petscksp.h" 
PetscErrorCode KSPSetApplicationContext(KSP ksp, void *usrP)
```
Logically Collective


## Input Parameters

- ***ksp -*** the `KSP` context
- ***usrP -*** optional user context





## Notes
The user context is a way for users to attach any information to the `KSP` that they may need later when interacting with the `KSP`

Use `KSPGetApplicationContext()` to get access to the context at a later time.


## Fortran Note
To use this from Fortran 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_ksp), `KSP`, `KSPGetApplicationContext()`

## Level
intermediate

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/ksp/interface/iterativ.c.html#KSPSetApplicationContext">src/ksp/ksp/interface/iterativ.c</A>


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