[R] lattice: two grouping variables, one controls 'col', the other 'pch'

[Gabor Grothendieck]

Try:

xyplot(y ~ x | f, pch = g1, col = g2, panel = function(x, y,
subscripts, ..., pch, col)
      panel.xyplot(x, y, ..., col = col[subscripts], pch = pch[subscripts])
)


On 1/28/07, Benjamin Tyner <btyner at stat.purdue.edu> wrote:
> Say I have
>
> library(lattice)
>
> x<-runif(256)
> y<-runif(256)
> f<-gl(16,16)
> g1<-rep(1:4,each=64)
> g2<-rep(1:4,times=64)
>
> plot<-xyplot(y~x|f,
>             groups=g1,
>             pch=as.character(1:4),
>             panel=function(x,y,subscripts,groups,...){
>                   panel.superpose(x,y,subscripts,groups,...)
>             })
>
> print(plot)
>
> Currently, both color and plotting symbol change with the grouping
> variable g1. What is the best way to have color change with g1, but
> plotting symbol change with g2 (or vice versa)?
>
> Thanks,
> Ben
>
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