José Luis Aznarte M. wrote:
> Hi again! I'm using the 'optim' method to fix the parameters of a
> model. I have written the function to be minimised and another function
> which returns the gradient of the error. Now my problem is that, in
> order to compute that gradient, it would be extrem
you need to use the `...' argument; look at ?optim() for more info.
Best,
Dimitris
Dimitris Rizopoulos
Ph.D. Student
Biostatistical Centre
School of Public Health
Catholic University of Leuven
Address: Kapucijnenvoer 35, Leuven, Belgium
Tel: +32/(0)16/336899
Fax: +32/(0)16/337015
Web: http:
Hi
Use the dots argument at the end to pass in named parameters.
This is documented as the last in the argument list under ?optim.
Here's a toy example using x and p:
> f <- function(x,p){sum(x^2)+p*sum(x)}
> gr <- function(x,p){2*x+p*rep(1,length(x))}
> optim(par=c(10,10),fn=f,gr=gr,p=13)
$
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