
Thanks to Manuel and Ben for their responses. Getting the midpoints as indicated in the responses did the trick. Thanks for the help.

Pedro


-----Original Message-----
From: Manuel Morales [mailto:Manuel.A.Morales@williams.edu]
Sent: Tue 3/20/2007 8:12 PM
To: Vera, Pedro L.
Cc: r-help@stat.math.ethz.ch; Ben Bolker
Subject: Re: [R] Problem adjusting x-labels with bargraphCI
 
On Tue, 2007-03-20 at 13:15 -0400, Vera, Pedro L. wrote:
> Hello:
>  
> I'm having quite a bit of difficulty adjusting the x-labels using bargraphCI. I've tried using text and srt=45 to rotate the labels or mtext for 2 lines to break up the labels. However, using either method, I cannot line up the labels with the midpoints of the bars (they line up with some sort of tick mark that is off the midpoint of the bars). Any suggestions would be greatly appreciated.
>  
> Regards
>  
> Pedro L. Vera, Ph.D.
> University of South Florida, Dept of Surgery

Assuming that you are asking about bargraph.CI from the sciplot package,
and that you are trying to get x-axis tick-labels that are perpendicular
to the x-axis, specifying las=2 in the call to bargraph.CI should work.

If you want more control, you can assign the output of bargraph.CI to an
object (a list that contains the x-values of the bars, summary stats,
and CIs). This will allow you to position labels at the x-values of the
plotted bars. For example:

test <- bargraph.CI(x.factor = dose, response = len, data = ToothGrowth, xaxt="n")
axis(side=1,at=test$xvals,labels=c("bar1","bar2","bar3"),las=2)

-- 
Manuel A. Morales
http://mutualism.williams.edu


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