df=data.frame(country=c("A","A","A","B","B","B"),
    food=rep(c("Apples","Pears","Bananas"),2),
    X2000=c(4,5,6,7,6,8),
    X2001=c(4,5,6,7,6,8),
    X2002=c(4,5,6,7,6,8),
    X2003=c(4,5,6,7,6,8));

I have data in the above form trying to get a plot of each fruit over time
year conditioned on country and food.

I tried,

xyplot(X2000+X2001+X2002+X2003~2000:2003|country*food,df)

But think I need to transform the data, just not sure
how.  Any help gratefully received.

Cheers,
Geoff.

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