Thanks for your help Peter
but the red marks on boxplot do not correspond to ex2 dataframe
actually, it reproduce on each panel the same marks
that is to say the 3 first lines of ex2
So this is not correct


Christophe

On Mon, Sep 27, 2010 at 6:18 PM, Peter Ehlers <ehlers@ucalgary.ca> wrote:

> On 2010-09-27 4:54, Christophe Bouffioux wrote:
>
>> bwplot(v2 ~ v1 | z, data = ex3, layout=c(3,2),
>>        pch = "|",
>>        par.settings = list(
>>        plot.symbol = list(alpha = 1, col = "transparent",cex = 1,pch =
>> 20)),
>>        panel = function(x, y){
>>             panel.bwplot(x, y)
>>             X<- tapply(ex3$v1b, ex3[,c(1,2)], max)
>>             Y<- seq(length(unique(ex3[,c(1,2)])))
>>             panel.points(X, Y, pch = 17, col = "red")
>>             })
>>
>>
> Perhaps this is what you're trying to achieve:
>
>
>  bwplot(v2 ~ v1 | z, data = ex3, layout=c(3,2),
>       panel = function(x, y){
>            panel.bwplot(x, y, pch="|")
>            X <- tapply(ex3$v1b, ex3[, 1:2], max)
>            Y <- seq(nrow(unique(ex3[, 1:2])))
>
>            panel.points(X, Y, pch = 17, col = "red")
>            })
>
> (I didn't see any need for your par.settings.)
>
> I'm not crazy about the way you define X,Y. I think
> I would augment the data frame appropriately instead.
>
>  -Peter Ehlers
>

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