[R] more than one level of grouping in xyplot

[Guazzetti Stefano]

Dear listers, 
Let use say that I want to display the Pixel dataset (in the NLME library)

xyplot(pixel~day|Dog, groups=Side, data=Pixel, panel=panel.superpose, panel.groups=panel.xyplot, type="b", pch=16)
(I know, there are better examples, ...)
Now, how could I change the colours of the symbols accordingly to another factor changing within subject and side form time to time? (let us say Pixel$Fever<-sample(rep(0:1,51)))

Thanks in advance, 


Stefano

 

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