And if you really do want a line segment try this:

M <- c(mean(a), mean(b))
segments(1:2-0.4, M, 1:2+0.4, M, col = "red")


On 9/26/06, Gabor Grothendieck <[EMAIL PROTECTED]> wrote:
> To prevent confusion you might want to use a red dot rather than
> a line:
>
>   points(1:2, c(mean(a), mean(b)), col = "red")
>
> and perhaps label it since its non-standard:
>
>   text(1:2, c(mean(a), mean(b)), "Mean", pos = 4)
>
> On 9/26/06, laba diena <[EMAIL PROTECTED]> wrote:
> > How to add a mean line in the boxplot keeping the median line ?
> > For example in this:
> >
> >
> > set.seed(1)
> >
> > a <- rnorm(10)
> >
> > b <- rnorm(10)
> >
> > boxplot(a, b)
> >
> >        [[alternative HTML version deleted]]
> >
> > ______________________________________________
> > R-help@stat.math.ethz.ch mailing list
> > https://stat.ethz.ch/mailman/listinfo/r-help
> > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> > and provide commented, minimal, self-contained, reproducible code.
> >
>

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