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

[Benjamin Tyner]

Thanks, that does the trick. I guess with two grouping variables it is 
best to bypass 'groups' entirely.'

Ben

Gabor Grothendieck wrote:
> 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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