[R] optim with gradient

[Göran Broström]

On Thu, 21 Mar 2002, Adrian Trapletti wrote:

[...]
> If the only goal is to improve speed, then you should consider to do 
> the full optimization within C/Fortran, i.e., to implement the errfunc 
> and the gradient in C and to call optim through the API (a new feature 
> of the upcoming version 1.5.0 as Brian told me). This may increase speed 
> - I just make a rough guess now - by a factor 100. 

I can hardly wait! I already make the heavy calculations in Fortran, so it 
should be easy to implement. Is the feature in R-devel now?
And documented?  

Thanks,

Göran

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