[R] change plotting symbol for groups in trellis graph

From: Tom Boonen <tom.boonen.maiden_at_gmail.com>
Date: Tue 30 Jan 2007 - 20:47:55 GMT


Hi,

how can I change the plotting symbol for the groups in a trellis panel dotplot.

My graph is similar to:

library(trellis)
dotplot(variety ~ yield | site, data = barley, groups = year,

             key = simpleKey(levels(barley$year), space = "right"),
             xlab = "Barley Yield (bushels/acre) ",
             aspect=0.5, layout = c(1,6), ylab=NULL)

I'd like to plot the different years with different symbols (eg. one with pch=19 the other with pch=21 or so). Thank you very much for your help.

Tom



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