[R] [R]: Trellis plot

[E. Corda]

Hi all,

I would be grateful if anyone could help me with the following. I am using
nlme library and I am trying to do a trellis plot with an outer factor, but
I have an error message which I can't understand.

Here is the code :

> mydata <- groupedData(y ~ x | warren/rabbit, outer= ~ treatment,
data=mydata)
> plot(mydata)
# I obtain a plot with all rabbits displayed individually and no outer factor.
> plot(mydata, outer = ~ treatment)
Error in order(na.last, decreasing, ...) : 
        Argument lengths differ

I use R 1.5.1 with Windows 2000.

I hope I've given enough information. Thanks a lot for your time.

Eve CORDA 
Office national de la chasse et de la faune sauvage
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Email : e.corda at oncfs.gouv.fr