Thanks
The first method,i get many lines,using the second,i get segments.I actually
need one line with y coordinate defined by aline,x along the boxplot.


On 7/22/06, Uwe Ligges <ligges@statistik.uni-dortmund.de> wrote:
>
> Jiantao Shi wrote:
>
> > Hi,
> > I have a data frame,
> >
> >
> >>df=rnorm(1000)
> >>dim(df)=c(100,10)
> >>
> >
> > And i can get the boxplot,
> >
> >
> >>boxplot(data.frame(df))
> >
> >
> >
> > So how can add a line (aline) on the existing boxplot,eg,
> >
> >
> > Thanks in advance.
>
> Example:
>
>
> df <- rnorm(1000)
> dim(df) <- c(100,10)
> boxplot(data.frame(df))
> aline <- apply(df, 2, max)
>
> # , now you might want either
> abline(h = aline, col = "green", lty="dotted")
> # or
> segments(seq(along = aline) - 0.2, aline,
>          seq(along = aline) + 0.2, aline,
>          lwd = 2, col = "red")
>
>
>
> Uwe Ligges
>
>
>
>
> >       [[alternative HTML version deleted]]
> >
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>
>

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