[R] xyplot question

[Leeds, Mark (IED)]

I have the code below and it works fine if I print the xyplot but if I
take the print out, then I just get a blank
pdf. The same holds if I just send the plot to the console without the
print ( I get nothing ). My question is whether this is always
the case with xyplot or is there something wrong with my settings ? I am
on linux ( redhat ) and using R.2.5.0. Thanks.


load("stocks.dat")

pdf('temp.pdf', width=10, height=8)

trellis.par.set(superpose.symbol=list(pch=19, cex=0.8)) # filled circles

print(xyplot(value ~ date|group, groups=wt, data=stocks.all, type='o',
layout=c(2,2),
    auto.key=list(columns=6), scales=list(x=list(rot=90))))

dev.off()

#=======================================================================
============================================


sessionInfo()
R version 2.5.0 (2007-04-23) 
i686-pc-linux-gnu 

locale:
C

attached base packages:
[1] "datasets"  "utils"     "stats"     "graphics"  "grDevices"
"methods"   "base"     

other attached packages:
 lattice filehash  reshape      zoo    chron     MASS 
"0.15-8"    "1.0"  "0.7.4"  "1.3-1" "2.3-11" "7.2-33"
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