# 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
 `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>


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[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)  
