# SNESMonitorFunction
functional form passed to `SNESMonitorSet()` to monitor convergence of nonlinear solver 
## Synopsis
```
#include <petscsnes.h>
$    PetscErrorCode SNESMonitorFunction(SNES snes,PetscInt its, PetscReal norm,void *mctx)
```
Collective on snes


## Input Parameters

- ***snes -*** the `SNES` context
- ***its -*** iteration number
- ***norm -*** 2-norm function value (may be estimated)
- ***mctx -*** [optional] monitoring context





## See Also
 `SNESMonitorSet()`, `SNESMonitorSet()`, `SNESMonitorGet()`

## Level
advanced

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/snes/interface/snes.c.html#SNESMonitorFunction">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](/docs/manualpages/index.md)  
[Index of all manual pages](/docs/manualpages/singleindex.md)  
