[R] confused about x-coordinates and bar charts

[Jay Pfaffman]

Thanks for all the help on my previous histogram problem.  I intend to
summarize the solutions back to the list Real Soon Now, but first, I've
got another problem.

I've made a bar chart that reports means.  I'd like to put the number
of observations on top of each bar.  Here's what I've got:

barplot((subset$x),
        col=grey(.5),
        ylab="Mean Engagement Rating",
        xlab="Comment Category",
        main="All Engagement Ratings",
        ylim=c(0,7),
        cex.names=.75,
        names.arg=mynames
        )


for (i in 1:7){
  text(i,as.numeric(subset$x[i])+.5,counts$x[i])
}


This would seem to do the trick, but the numbers are not centered over
the bars.  They're a bit to the right on the bars on the left and
almost right on the bars on the right.  I don't understand why the
scale is not the same.  

Thanks again for your help.

-- 
Jay Pfaffman                           pfaffman at relaxpc.com
+1-415-821-7507 (H)                    +1-415-812-5047 (M)