[SciPy-user] Problem with NLP in OpenOpt

Dark Wind darkwind.87@gmail....
Mon Nov 19 18:31:01 CST 2007


Thank a lot. Scipy_Cobyla worked, but I am not getting how exactly to
install ALGENCAN on windows? Do I need cygwin to install it on
windows?

thanks

On Nov 15, 2007 8:54 AM, Dominique Orban <dominique.orban@gmail.com> wrote:
> On 11/15/07, Dark Wind <darkwind.87@gmail.com> wrote:
> > The initial value x0 satisfies the constraints hi's but i am still
> > getting that there is no feasible solution.
> >
> > Can anyone help me with this?
>
> Cobyla is an infeasible method, meaning that in order to identifiy a
> solution to your problem, it will venture outside of the feasible set.
> In your example, it wasn't able to reach a feasible solution within
> the given limits (max number of iterations, tolerances, ...) It is not
> because their is a feasible point that the code will be able to find a
> solution; in this case, it got stuck before reaching the feasible set
> again.
>
> You can either re-solve your problem with looser tolerances, which is
> not very satisfactory, you can re-solve from a different starting
> point (which doesn't have to be feasible), or you can try another
> solver (as Dmitrey showed in his response).
>
> Dominique
>
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