Re: [Rd] motivation for setRepositories and chooseCRANmirror

From: Uwe Ligges <ligges_at_statistik.uni-dortmund.de>
Date: Sat 18 Jun 2005 - 13:16:35 GMT

Jeffrey Horner wrote:

> I have some questions and observations about these:
>
> Will these replace manually setting options(CRAN), which doesn't work in
> R-2.1.0?
>
> In R-2.1.0, setRepositories() looks to see if options("repos") contains
> a CRAN entry and will not override that CRAN entry even if the
> $R_HOME/etc/repositories file (which setRepositories reads from)
> contains a CRAN entry. Why is this? The user could easily set
> options("repos") without the help of this function anyway? And
> chooseCRANmirror() obviously sets the CRAN entry correctly.
>
> I've checked the latest nightly tarball, R-devel_2005-06-15.tar.gz, and
> this observations persists.
>
> I also observe that the R-2.1.0 Rprofile in the base package sets
> options(repos=c(CRAN="@CRAN@")), so it seems that the only way to set
> the CRAN repository entry is either with chooseCRANmirror() or manually
> setting options("repos") or options("CRAN"). If this was not the case,
> then setRepositories() would choose the CRAN entry from
> $R_HOME/etc/repositories.
>
> In R-2.1.0 and in R-devel_2005-06-15.tar.gz, the R-admin manual suggests
> that for packages to be downloaded and installed within R should set
> options(CRAN = "http://cran.us.r-project.org/"). Will this be changed to
> calling chooseCRANmirror()?
>
> From an administrator's point of view, I would like to have the CRAN
> option set automatically on R startup for ALL users. That way I don't
> have to set this option before calling update.packages().
>
>

Hence, I have in our department's R installation's .../R/etc/Rprofile.site file (which is intended for configurations that apply to all users):

options(repos = c(

           CRAN = "http://umfragen.sowi.uni-mainz.de/CRAN",
           CRANextra = "http://www.stats.ox.ac.uk/pub/RWin"))


Uwe Ligges



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