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

From: Benjamin Tyner <btyner_at_stat.purdue.edu>
Date: Mon 29 Jan 2007 - 04:41:10 GMT


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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