[R] Label / Tick under single Boxplot
Marc Schwartz
MSchwartz at MedAnalytics.com
Wed Apr 20 04:26:47 CEST 2005
On Wed, 2005-04-20 at 02:08 +0200, Werner Wernersen wrote:
> 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
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