[R] lattice and several groups

[Gabor Grothendieck]

Try this:

xyplot(val ~ x, data = df, type = "p",
	col = as.numeric(df$f1), pch = as.numeric(df$f2))

key1 <- list(border = TRUE, colums = 2, text = list(levels(df$f1)),
	points = list(pch = 1:nlevels(df$f1))
)

key2 <- list(border = TRUE, colums = 2, text = list(levels(df$f2)),
	points = list(pch = 20, col = 1:nlevels(df$f2))
)

trellis.focus("panel", 1, 1)
draw.key(key1, draw = TRUE, vp = viewport(.9, .9))
draw.key(key2, draw = TRUE, vp = viewport(.75, .9))
trellis.unfocus()


On 8/29/06, Laurent Rhelp <laurentRhelp at free.fr> wrote:
> Dear R-list,
>
>     I would like to use the lattice library to show several groups on
> the same graph. Here's my example :
>
> ## the data
> f1 <- factor(c("mod1","mod2","mod3"),levels=c("mod1","mod2","mod3"))
> f1 <- rep(f1,3)
> f2 <- factor(rep(c("g1","g2","g3"),each=3),levels=c("g1","g2","g3"))
> df <- data.frame(val=c(4,3,2,5,4,3,6,5,4), x=rep(c(1,2,3),3),f1=f1,f2=f2)
> #############################################################
> library(lattice)
>
> para.liste <- trellis.par.get()
> superpose.symbol <- para.liste$superpose.symbol
> superpose.symbol$pch <- c(1,2,3)
> trellis.par.set("superpose.symbol",superpose.symbol)
>
> # Now I can see the group according to the f1 factor (with a different
> symbol for every modality)
> xyplot( val~x,
>        data=df,
>        group=f1,
>        auto.key=list(space="right")
>       )
>
> # or I can see the group according to the f2 factor
> xyplot( val~x,
>        data=df,
>        type="l",
>        group=f2,
>        auto.key=list(space="right",points=FALSE,lines=TRUE)
>       )
>
> How can I do to highlight both the f1 and f2 factors on one panel with
> the legends, using the lattice function ?
>
> Thanks
>
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