:orphan:
# SNESGetConvergenceHistory
Gets the array used to hold the convergence history. 
## Synopsis
```
#include "petscsnes.h"  
PetscErrorCode SNESGetConvergenceHistory(SNES snes, PetscReal *a[], PetscInt *its[], PetscInt *na)
```
Not Collective


## Input Parameter

- ***snes -*** iterative context obtained from `SNESCreate()`



## Output Parameters

- ***a   -*** array to hold history, usually was set with `SNESSetConvergenceHistory()`
- ***its -*** integer array holds the number of linear iterations (or
negative if not converged) for each solve.
- ***na  -*** size of `a` and `its`





## Note
This routine is useful, e.g., when running a code for purposes
of accurate performance monitoring, when no I/O should be done
during the section of code that is being timed.


## Fortran Note
The calling sequence for this routine in Fortran is
```none
    call SNESGetConvergenceHistory(SNES snes, integer na, integer ierr)
```



## See Also
 [](ch_snes), `SNES`, `SNESSolve()`, `SNESSetConvergenceHistory()`

## Level
intermediate

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


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[Index of all SNES routines](index.md)  
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[Index of all manual pages](/manualpages/singleindex.md)