Hi James,
If that's the case, then

set.seed(123)
x <- c(4,rnorm(20),8)
bp <- boxplot(x)
bp$out
# [1] 4 8
which(x %in% bp$out)
# [1]  1 22

is what you are looking for.  :-)

HTH,
Jorge


On Wed, Sep 9, 2009 at 4:07 PM, <guox@ucalgary.ca> wrote:

> Thank you very much.
> But it seems that
> x$out returns the values not the indexes of the  values (1,22).
> -james
>
> > boxplot returns a dataframe that has the values in it at "$out":
> >
> >> x <- boxplot(c(4,rnorm(20),8))
> >> x
> > $stats
> >            [,1]
> > [1,] -1.5364498
> > [2,] -0.5282799
> > [3,] -0.1398736
> > [4,]  0.3065579
> > [5,]  1.3430388
> >
> > $n
> > [1] 22
> >
> > $conf
> >            [,1]
> > [1,] -0.4210947
> > [2,]  0.1413474
> >
> > $out
> > [1] 4 8
> >
> > $group
> > [1] 1 1
> >
> > $names
> > [1] "1"
> >
> >
> >
> > On Wed, Sep 9, 2009 at 3:25 PM, <guox@ucalgary.ca> wrote:
> >> I am wondering if you know how to return by function or show in
> >> boxplot,
> >> the indexes of unusual points, such as,
> >> points that are outside the box or in [Q3+1.5IQR,Max].
> >> For example,
> >>
> >>> boxplot(c(4,rnorm(20),8))
> >>
> >> There are 2 unusual points 4 and 8. How to show the indexes of 4 and 8
> >> in
> >> the boxplot
> >> or return them by function?
> >>
> >> Thanks,
> >>
> >> -james
> >>
> >> ______________________________________________
> >> R-help@r-project.org 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.
> >>
> >
> >
> >
> > --
> > Jim Holtman
> > Cincinnati, OH
> > +1 513 646 9390
> >
> > What is the problem that you are trying to solve?
> >
> >
> >
>
> ______________________________________________
> R-help@r-project.org 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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