# SNESNGSFunction
function used to apply a Gauss-Seidel sweep on the nonlinear function 
## Synopsis
```
#include <petscsnes.h>
$    SNESNGSFunction(SNES snes,Vec x,Vec b,void *ctx);
```
Collective on snes


## Input Parameters

- ***X   -*** solution vector
- ***B   -*** RHS vector
- ***ctx -*** optional user-defined Gauss-Seidel context



## Output Parameter

- ***X   -*** solution vector





## See Also
 `SNESNGS`, `SNESSetNGS()`, `SNESGetNGS()`

## Level
intermediate

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