[R] RE: [S] tree function in R language

From: Liaw, Andy <andy_liaw_at_merck.com>
Date: Thu 29 Jul 2004 - 14:08:36 EST

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Andy

> From: cheng wu
>
> Hi, Andy
>
> Thank you for your answer.
>
> Why I can't load CRAN packages?
>
> the error message is:
>
> > {a <- CRAN.packages()
> + install.packages(select.list(a[,1],,TRUE), .libPaths()[1],
> available=a)}
> trying URL `http://cran.r-project.org/bin/windows/contrib/PACKAGES'
> unable to connect to 'cran.r-project.org'.
> Error in download.file(url = paste(contriburl, "PACKAGES",
> sep = "/"), :
> cannot open URL
> `http://cran.r-project.org/bin/windows/contrib/PACKAGES'
>
>
>
> >From: "Chushu Gu" <chushugu@hotmail.com>
> >To: "cheng wu" <wu_cheng2001@hotmail.com>
> >Subject: Fw: [S] tree function in R language
> >Date: Wed, 28 Jul 2004 09:14:48 -0400
> >
> >
> >----- 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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