:orphan:
# SNES_DIVERGED_FNORM_NAN
the 2-norm of the current function evaluation is not-a-number (NaN), this is usually caused by a division of 0 by 0. 


## See Also
 [](ch_snes), `SNES`, `SNESSolve()`, `SNESGetConvergedReason()`, `SNESConvergedReason`, `SNESSetTolerances()`

## Level
beginner

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/include/petscsnes.h.html#SNES_DIVERGED_FNORM_NAN">include/petscsnes.h</A>


---
[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/include/petscsnes.h)


[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)