'cex' means character expansion. It is linear magnification: that is
all linear dimensions (including height and width) are proportional to
cex).
You are confusing matters by giving a lattice example. 'cex' is a
concept from base graphics (see ?par, which I believe is unambiguous
in saying it is a magnification), but lattice is built on grid. And
?grid::gpar says
cex Multiplier applied to fontsize
On Wed, 9 Mar 2011, Al Roark wrote:
I'm wondering how the cex parameter is used to scale circles (i.e.
does it scale the radius, diameter, area, circumference, etc.?). In
my case I'm using lattice with filled circles (pch=19).
Based on example, it looks like R scales the radius of the circle:
library(lattice)
dta<-data.frame(x=rep(1,6),y=rep(1,6),sz=c(1,2,4,8,16,32))
xyplot(x~y,data=dta,col=rgb(0,0,0,50,maxColorValue=255),cex=dta$sz,pch=19)
But I haven't been able to find confirmation in any R documentation,
so any assistance would be much appreciated. Cheers.
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Brian D. Ripley, rip...@stats.ox.ac.uk
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