Hi, I think the size mismatch occurs because of a different default for the fontsize (and grid.points has a size of 1 character by default). Compare the following two examples,
# default grid.newpage() pushViewport(viewport(x=unit(0.5, "npc"), y=unit(0.5, "npc"))) lplot.xy(data.frame(x=0.55,y=0.5),type="p", pch=3) grid.points(x=0.45,y=0.5, pch=3, gp=gpar(col="red")) trellis.par.set("fontsize", list(points=12)) grid.newpage() pushViewport(viewport(x=unit(0.5, "npc"), y=unit(0.5, "npc"))) lplot.xy(data.frame(x=0.55,y=0.5),type="p", pch=3) grid.points(x=0.45,y=0.5, pch=3, gp=gpar(col="red")) HTH, baptiste 2009/12/4 Sebastien Bihorel <sebastien.biho...@cognigencorp.com>: > Dear R-users, > > For the past few days, I have been trying to find the reason why some of my > plots were showing symbols of different sizes, while I thought I was using > the same .cex arguments everywhere. The problem is exemplified by the > following example code where the xyplot and grid.points functions are used. > The scaling factor is set to 0.84 in both the functions settings, but one > can see that, in the pdf file, the blue symbols plotted by xyplot are > smaller than the single black symbol created by grid.points. Playing with > the trellis settings did not seem to solve the problem. I am missing a > hidden scaling factor somewhere, but don't know where to look anymore > > I would greatly appreciate the feedback of the list on this issue. > > library(lattice) > library(grid) > > pdf(file="test.pdf") > > df <- data.frame(a=1:12,b=1:12,c=rep(1:4,each=3)) > > #trellis.par.set(superpose.symbol=list(cex=1)) > > xyplot(b~a|c, > data=df, > panel = function(x,y){ > panel.xyplot(x,y,pch=3,cex=0.84)} > ) > > str(trellis.par.get()) str(get.gpar()) > grid.points(x=100,y=85,pch=3,gp=gpar(cex=0.84)) > > dev.off() > > ______________________________________________ > 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. > ______________________________________________ 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.