Marc Girondot <marc_grt <at> yahoo.fr> writes:
>
> Le 18/05/12 00:14, Nathan Stephens a écrit :
> > I have a very simple maximization problem where I'm solving for the vector
> > But I get inconsistent results depending on what starting values I. I've
> > tried various packages but none seem to bee the very solver in Excel. Any
> > recommendations on what packages or functions I should try?
> > [...]
> I had similar problem to solve (x were frequencies) and optimization
> stops before to reach the global maximum. As [...] indicate[d], I fitted
> {x}-1 values because the last one is known by the equality constraint.
>
> For the vector constraints, I used w <- -Inf when x goes out of the limits.
Same as before:
Would you *please* post data and code, as the posting guide requests!
The variable that is left out still has some (linear) inequalities to fullfil.
I didn't understand how you worked that out with optim() as it only allows to
include box constraints.
Hans Werner
> Finally I used Bayesian mcmc to get the convergence and it works much
> better.
>
> I don't know why in this case the optim does not converge.
>
> Hope it hepls,
>
> Marc
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