[Ipopt] Limited-memory quasi-newton option

[Andreas Waechter]

Hi Andre,

Sorry for the delayed reply.

I assume you figured it out by now, but, yes, to pose an unconstrained 
problem to Ipopt you need to set the number of constraints m to zero. 
I believe you do not need to supply callback functions for the evaluation 
of constraint values and derivatives, if you setting those pointers to 
NULL causes a segmentation fault, you can just provide dummy functions 
that simply return true (1).

Regards,

Andreas

On Thu, 11 Nov 2010, loerx wrote:

> Hi,
>
> after the quick answer to my compiling problem a couple of weeks ago, -
> thanks!!! -, I come up to you with another short question.
>
> I'd like to solve a plain nonlinear problem using the limited-memory
> quasi-newton option with box-constraints. (There are no linear or
> nonlinear constraints, g(x) < 0.)
> Is it enough to set the number of constraints index to zero (or maybe
> -1)? Do I have to provide the evaluation functions eval_jac_g, etc?
> What should they return?
>
> I'm using the C interface. Any help would be very nice!
>
> Best regards,
> Andre
>
> -- 
>
>
> +-- --- --- --- --- --- --- --- --- --- --- --- --+
> Andre Loerx
>
> University of Trier
> FB IV - Department of Mathematics
> 54286 Trier, Germany
>
> phone: +49 651 201 3468
> fax:   +49 651 201 3973
> email: loerx at uni-trier.de
> www:   http://www.mathematik.uni-trier.de/~loerx
> +-- --- --- --- --- --- --- --- --- --- --- --- --+
>
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