Section 6.8 of the writing R extensions manual mentions this:

6.8 Optimization
The C code underlying optim can be accessed directly. The user needs  
to supply a function to
compute the function to be minimized, of the type
typedef double optimfn(int n, double *par, void *ex);

And also vmmin() and quite a few others optimization routines
whose interfaces are in: ‘R_ext/Applic.h’


Hope this is what you're looking for, Ingmar


On 8 Mar 2007, at 03:35, Mervyn G Marasinghe wrote:

> Hello:
>
> I am sure this question was dealt with several years ago.  Is the  
> function
> vmmin()  available  from Rmath Standalone? If not is it possible   
> to call
> optim()  or  nlm()  from Rmath in C.  Thank you.
>
> Mervyn
>
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> PLEASE do read the posting guide http://www.R-project.org/posting- 
> guide.html
> and provide commented, minimal, self-contained, reproducible code.


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