Label / Tick under single Boxplot

Hi!

I am trying to get the tick / label under a stacked
boxplot with only a single 
data row. With >=2 rows it works, but with a single
one the tick resp. my class 
name is not printed below the boxplot. Can anybody
point me to what am I doing 
wrong?

For example:
boxplot(data.frame(c(3,4,5)),names=list("a"),beside=F)

Here, I would like to have the "a" below the single
box.

Thanks a lot,
   Werner

using R 2.0.1 on Win2K

Werner,

Just to be sure that you do want a boxplot and not a barplot, as in the
former case, the 'beside=F' is unused.

Presuming that you do want a boxplot, there is the following code in the
bxp() function, which actually does the plotting:

 if (is.null(show.names)) 
    show.names <- n > 1
 if (show.names) 
    do.call("axis", c(list(side = 1 + horizontal, at = at, 
            labels = z$names), ax.pars))

The result of the first if() statement in the case of a single group (n
= 1) is that the names are not plotted.

Thus, you can do the following:

boxplot(3:5)
axis(1, at = 1, "a")

Presuming that you do not modify the 'at' argument in the call to
boxplot(), the boxes are by default drawn at integer values on the x
axis, which in this case is 1.

HTH,

Marc Schwartz