[R] constraints in optim?
Prof Brian Ripley
ripley at stats.ox.ac.uk
Sat Oct 2 10:11:40 CEST 2004
Do you know what you are doing using method SANN? It is a very strange
choice for a 2D problem. Method L-BFGS-B would allow non-negativity
optim() does not have control options trans and times ...
The standard way would be to transform your problem, for example to
optimize over log-parameters, if you really meant `positive' and not
On Sat, 2 Oct 2004, Christian Schulz wrote:
>  17.422635 -1.606859
> How could i constraint that the parameters should be both positive in
> my maximizing problem?
> I check constrOptim but here i could only constraint the variables trans and
> times and not my parameters?
> PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
That applies to YOU.
Brian D. Ripley, ripley at stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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