R help - May 2011 - L-BFGS-B and parscale in optim()

Hi,

When using method L-BFGS-B along with a parscale argument, should the
lower and upper bounds provided be on the scaled or unscaled values?
Thanks.

Cheers,

-- 
Seb

Sebastian P. Luque <spluque <at> gmail.com> writes:
> 
> Hi,
> 
> When using method L-BFGS-B along with a parscale argument, should the
> lower and upper bounds provided be on the scaled or unscaled values?
> Thanks.
  I think you can figure this out by experimentation on your own,
but I believe that all of the scaling done by parscale is internal
(i.e., you should provide bounds on the original, unmodified scale).