[R] Lattice dotplot with symbols sized and colored

From: David Kidd <dmk2_at_st-andrews.ac.uk>
Date: Tue 03 May 2005 - 21:39:47 EST

Sundar suggested setting up a theme which I have done...

my.theme <- function() {

   theme <- col.whitebg()
   symb <- theme$superpose.symbol
   symb$col= c("red","blue","green","yellow","orange","black","purple")    #symb$pch is c(1,3,6,0,5,16,17) by default for col.whitebg    theme$superpose.symbol <- symb
   theme
}
trellis.par.set(theme = my.theme())
# from ?dotplot
dotplot(sporder ~ cvarorder | direct, data=sp.nc.bdrs.data, groups = sp.nc.bdrs.data$mysign,
cex=abs(sp.nc.bdrs.data$mwZ * 0.05),
xlab="climate variables",
ylab="species",
scales = list(y = list(labels = as.character(spname),at = 1:12, cex = 0.5), x = list(labels = as.character(my.ylabel), at = 1:66, rot=90, cex = 0.5),
alternating = 3))

Now if I am understanding lattice correctly setting symb$cex sets the size multiplier for symbols within each group but does not support the differential sizing of symbols for each record independently within each group. Hence I have tried to use a 'global' cex (after the groups statement), however, this has no effect on the displayed symbol size. Do I need to change the pch or another parameter to draw sized filled circles as is the default symbol for dotplot?

Thanks
Dave



David M. Kidd
Research Assistant
School of Biology
Room 210, Sir Harold Mitchell Building
University of St. Andrews
St. Andrews, Fife
KY16 9TH
UK
http://www.st-and.ac.uk/~bugs/dave/dave.htm Tel: +44 (0)1334 463348
Fax: +44 (0)1334 463600

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