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Using sub to get captions in barplots

All,

I've been using "sub" (subtitle) instead of "main" such that captions are
below figures produced by xyplot.  This works fine and captions are on a
single line.  However, when I try this for bar plots with error bars
(altering the error.bars function form Crawley's The R Book, see below), the
captions are split on more than 1 line.  Is there a way to get the caption
on a single line? 

Cheers,
David




y.bar.new = c(30, 15)
se.ybar.new = c(2,3)
error.bars(y.bar.new, se.ybar.new, c("Control (n=18)", "CKD (n=18)"))


error.bars<-function(yv,z,nn){
xv<-barplot(yv,ylim=c(0,(max(yv)+max(z))),names=nn,ylab="Total five hour
potassium excretion (mmol)", sub= "Figure 1B: Hour
1-5 potassium excretion")
g=(max(xv)-min(xv))/50
for (i in 1:length(xv)) {
lines(c(xv[i],xv[i]),c(yv[i]+z[i],yv[i]-z[i]))
lines(c(xv[i]-g,xv[i]+g),c(yv[i]+z[i], yv[i]+z[i]))
lines(c(xv[i]-g,xv[i]+g),c(yv[i]-z[i], yv[i]-z[i]))
}}
R version 2.7.1 (2008-06-23)
i386-apple-darwin8.10.1

locale:
en_US.UTF-8/en_US.UTF-8/C/C/en_US.UTF-8/en_US.UTF-8

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

other attached packages:
[1] lattice_0.17-8 nlme_3.1-89

loaded via a namespace (and not attached):
[1] Matrix_0.999375-11 lme4_0.999375-24   tools_2.7.1