[R] optim function

Dimitris Rizopoulos dimitris.rizopoulos at med.kuleuven.be
Thu May 11 13:06:37 CEST 2006

probably you want to look at ?try; I hope it helps.


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://www.med.kuleuven.be/biostat/

----- Original Message ----- 
From: "R Granell, Medicine" <Raquel.Granell at bristol.ac.uk>
To: <r-help at stat.math.ethz.ch>
Sent: Thursday, May 11, 2006 12:18 PM
Subject: [R] optim function

> Hello,
> I want to use optim with simulated data.
> My program generates a sample and then calls optim to optimise a 
> function
> that depends on the generated sample.
> I want to do this with 100 samples. But optim does not 'work' for 
> the 100
> samples, sometimes I get a message saying that sigma matrix was not
> invertible and therefore the optimisation was not carried out, and 
> then my
> program breaks.
> Is there any way to implement a condition to avoid this? I mean, how 
> can I
> specify that if this is the case, ignore such sample and try with 
> the next
> one.
> Many thanks for your help
> Raquel
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