x-axis label for boxplot

I am trying to produce three boxplots and label the x axis values:
xvalues, yvalues, zvalues.

My code is below. The labels are not below the three boxplots. If  
you could show me how to get the
labels below the columns I would be appreciative.
John

jdata<-data.frame(x =  
rnorm(100),y=rnorm(100,1),z=rnorm(100,-1),y=runif(100))

boxplot(jdata[,"x"],jdata[,"y"],jdata[,"z"],xlab=c("x  
values","yvalues","zvalues"))

You seem to be suffering under the delusion (fostered by the naming  
conventions and the state of documentation that does a poor job of  
distinguishing these issues) that "xlab" and "ylab" are going to be  
labels for individual groups or values along axes. They are not.

Instead (.. and using something more generic for xlab like "Grouping")

axis( 1, at=1:3, labels=c("x values","yvalues","zvalues") )
David.
> John David Sorkin M.D., Ph.D.
> Chief, Biostatistics and Informatics
> University of Maryland School of Medicine Division of Gerontology
> Baltimore VA Medical Center
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David Winsemius, MD
West Hartford, CT

x-axis label for boxplot

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