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

[Uwe Ligges]

Marc Schwartz wrote:
> Shouldn't the URL be (for R 1.8.1 on Windows):
> 
> http://cran.r-project.org/bin/windows/contrib/1.8/PACKAGES
> 
> There is no URL as listed below, which is presumably why the error
> message.

The URL geven below indicates that the code in the base package is R <= 
1.6.x. These outdated versions are not supported any more.

Uwe Ligges

> Was options()$CRAN changed improperly or is there some other Windows
> specific issue that is escaping me at the moment?
> 
> BTW, you should upgrade to R 1.9.1, as you are two versions behind at
> this point.
> 
> HTH,
> 
> Marc Schwartz
> 
> On Wed, 2004-07-28 at 23:08, Liaw, Andy wrote:
> 
>>1. Could it be that your computer is behind a firewall?  If so, try reading
>>the R for Windows FAQ.
>>
>>2. Please ask R-related question on R-help instead of S-news.
>>
>>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 at hotmail.com>
>>>>To: "cheng wu" <wu_cheng2001 at 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 at merck.com>
>>>>To: "'chushu Gu'" <chushugu at hotmail.com>; 
>>>
>>><s-news at 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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