R help - Jan 2003 - : Trellis plot

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
5, rue de Saint Thibault
SAINT-BENOIST
78610 AUFFARGIS
BP 20 - 78612 LE PERRAY EN YVELINES Cedex
FRANCE
Tel : +33 (0)1.30.46.60.64
Fax : +33 (0)1.30.46.60.99
Email : e.corda at oncfs.gouv.fr

Hello everybody,

I have found the solution to my problem. Instead of
writing
> plot(mydata, outer = ~ treatment)
I should write 
> plot(mydata, outer = ~ mydata$treatment)
>"E. Corda" <e.corda at oncfs.gouv.fr> writes:
>
>> 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.
>
>Could you upgrade to R-1.6.2 and try again?  There were a lot of
>changes to the nlme package since R version 1.5.1.  I'm not sure if
>this specific problem was fixed but it may have been.
>
>
Eve CORDA 
Office national de la chasse et de la faune sauvage
5, rue de Saint Thibault
SAINT-BENOIST
78610 AUFFARGIS
BP 20 - 78612 LE PERRAY EN YVELINES Cedex
FRANCE
Tel : +33 (0)1.30.46.60.64
Fax : +33 (0)1.30.46.60.99
Email : e.corda at oncfs.gouv.fr