The problem has been settled following your instruction, thanks a lot.
Chushu Gu
----- Original Message -----
From: "Liaw, Andy" <andy_liaw@merck.com>
To: "'chushu Gu'" <chushugu@hotmail.com>; <s-news@lists.biostat.wustl.edu>
Sent: Tuesday, July 27, 2004 11:22 PM
Subject: Re: [S] tree function in R language
> Have you read the (latest edition of the) book for which the package you
are
> using supports? There are differences in S-PLUS and R (and the 4th
edition
> of MASS supports both, thus ought to tell you this particular difference
> between the two). tree() in S-PLUS is written originally by Clark and
> Pregibon. If you want that functionality in R, you need to load the
`tree'
> package (available on CRAN), which is an independent implementation by one
> of the co-authors of MASS.
>
> Another hint: Look in the `scripts' subdirectory of where the `MASS'
package
> is installed.
>
> Andy
>
> > From: chushu Gu
> >
> > Hi all,
> >
> > I am using R 1.8.1, I have the following code,
> >
> > library(MASS)
> > data(iris)
> > ir.tr <- tree(Species ~., iris)
> > ir.tr
> > summary(ir.tr)
> >
> >
> > I got the following message:
> >
> > Error: couldn't find function "tree"
> >
> > I don't the reason, as I already load the library "MASS".
> >
> > Could anyone tell me the possible reasons?
> >
> > Thanks,
> >
> > Chushu Gu
> >
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