[Ipopt] Restoration Failed

[Bruno Guerreiro (ISR)]

Dear all,

Indeed, I had a problem on the indexes of the hessian sparce matrix.
Now everything is running smooth! Thanks for the help!!

By the way, I'd like to thank the authors and maintainers of the Ipopt 
project and highlight its importance for the scientific community. 
Congratulations for this great work and for the clarity of mind to share 
it with everyone!

Sincerely,

Bruno Guerreiro

Andreas Waechter wrote, On 09/09/2009 07:05 PM:
> Hi Bruno,
>
>> From the output, there seems to be something wrong with your function 
> evalution code, as Stefan has suggested.  Furthermore, you are 
> starting with an almost optimal point it seems (primal and dual 
> infeasibilities are very small), and yet Ipopt cannot compute a search 
> direction in the first iteration - MA27 keeps saying that the KKT 
> matrix is rank-deficient, even though it does perturbations of the KKT 
> matrix that usually make that go away.
>
> But the most telling thing is that your error is not deterministic.  
> This probably means that there is a memory error (such as accessing 
> uninitialized memory).  I suggest you run your program with a memory 
> checker, such as valgrind (free memory checker on Linux).
>
> Regards,
>
> Andreas
>
>
>
> On Wed, 9 Sep 2009, Bruno Guerreiro (ISR) wrote:
>
>> Hi Ali,
>>
>> I have both 3.6.1 and 3.7.0 installed.
>> However, I get exactly the same behavior with either one.
>>
>> My greatest problem with this bug, is that it seams to be non
>> deterministic, in the sense that, when I get a "Restoration failed" on
>> one run, if I run the solver again with exactly the same conditions, it
>> is very probable that I'll get an "Optimal solution found".
>>
>> Best,
>>
>> Bruno Guerreiro
>>
>>
>> Ali Baharev wrote, On 09/08/2009 06:28 PM:
>>> Hi,
>>>
>>> Which version of IPOPT are you using?
>>>
>>> I had problems with the restoration phase with 3.7.0, see:
>>>
>>> http://list.coin-or.org/pipermail/ipopt/2009-August/001659.html
>>>
>>> Ali
>>>
>>>
>>
>> _______________________________________________
>> Ipopt mailing list
>> Ipopt at list.coin-or.org
>> http://list.coin-or.org/mailman/listinfo/ipopt
>>
>