Thanks!
Sebastien
On Mon, Aug 22, 2011 at 2:11 PM, Marc Schwartz <marc_schwa...@me.com> wrote:
> On Aug 22, 2011, at 12:14 PM, Sébastien Vigneau wrote:
>
> > Hi,
> >
> > I would like to draw a stacked bar chart with four bars (say "a", "b",
> "c",
> > "d") . Two bars belong to group A and the two others to group B.
> Therefore,
> > I would like to have, on the x-axis, a label for each bar and an
> additional
> > label for each group, positioned underneath. To give an idea, the x-axis
> > labels should look like this:
> > |a|b|c|d|
> > | A | B |
> >
> > Do you know how I can generate such two-levels labels in R?
> >
> > Thank you for your help!
> >
> > Sebastien
>
>
> See ?barplot and note in the Value section:
>
> If beside is true, use colMeans(mp) for the midpoints of each group of
> bars, see example.
>
>
> Here is another example:
>
> mat <- matrix(1:4, ncol = 2)
>
> mp <- barplot(mat, beside = TRUE)
>
> Groups <- c("A", "B")
> Sub.Groups <- c("a", "b", "c", "d")
>
> mtext(side = 1, line = 1, at = mp, text = Sub.Groups)
> mtext(side = 1, line = 3, at = colMeans(mp), text = Groups)
>
>
> HTH,
>
> Marc Schwartz
>
>
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