[R] Passing parameters to 'optim' fn function

[Dimitris Rizopoulos]

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://med.kuleuven.be/biostat/
     http://www.student.kuleuven.be/~m0390867/dimitris.htm


----- Original Message ----- 
From: ""José Luis Aznarte M."" <aznarte at ugr.es>
To: <r-help at stat.math.ethz.ch>
Sent: Wednesday, September 12, 2007 10:32 AM
Subject: [R] Passing parameters to 'optim' fn function


>    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 extremely convenient to 
> be
> able to pass some parameters to the gradient function. I don't see 
> how
> to do it given the fixed syntax of 'optim', which does not allow for
> parameters being passed to fn and gr:
>
> > optim(par, fn, gr = NULL, ...)
>
>    Of course the first idea would be to "pack" the extra parameters 
> in
> the vector 'par', but in that case the extra parameters would be
> optimized too.
>    Does anyone have an idea on how to pass parameters to gr in 
> optim?
> Thanks for your time!
>
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