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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