MATPOWER does not include case11.m, so I am not able to reproduce the problem. 
Are you using runse? 

-- 
Ray Zimmerman
Senior Research Associate
B30 Warren Hall, Cornell University, Ithaca, NY 14853  USA
phone: (607) 255-9645

On Aug 20, 2014, at 2:02 AM, Mahesh P <[email protected]> wrote:

> Dear Sir,
> 
>                   I am performing state estimation on ill-conditioned system 
> namely: 11-bus system and 13-bus system. I am trying to execute case11.m in 
> Matpower. The program is executing well however, it is displaying state 
> estimator converged in 4 iterations and also displayed did not converged in 
> (0.02 sec).
> 
> So, my question is did state estimation algorithm is converged or did not 
> converged for ill-conditioned 11-bus system.
> 
>  
>                                               Thanking you,
> 
>  
> With Regards,
> 
> P.Mahesh
> Email: [email protected]
> 

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