'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.
        [[alternative HTML version deleted]]

______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.


--
Brian D. Ripley,                  rip...@stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.

Reply via email to