RFC: Loading packages at startup
Thu, 24 Oct 2002 17:53:31 +0100 (BST)
On Thu, 24 Oct 2002, David James wrote:
> I think the proposed changes will be useful. A couple of points
> (mostly for simplicity):
> Prof Brian D Ripley wrote:
> > ...
> > 3) It would be useful to allow the library tree to be specified, as a
> > second field on the line.
> Other than convenience (nothing wrong with that, of course) I don't
> see too much need for this. The .Renviron files may already have defined
> R_LIBS, so the library tree may already be specified.
It's important if one wants to save the list to know which library list
was in use at the time. R_LIBS is subject to change.
> > 5) We might want to allow a .Rpackages file to override Rpackages.site
> > (or we might not). One idea is to allow a minus sign in front of a
> > package name, and to merge the Rpackages.site and .Rpackages files
> > before loading any packages. If we did this we probably need to be
> > able to save the list of packages to be loaded (and can't easily save
> > those not to be loaded), so perhaps -- as the first list of .Rpackages
> > should empty the list.
> Why not using arguments to R, say, --no-site-Rpackages and --no-Rpackages,
> similar to --no-environ, --no-site-file, --no-init-file, and friends?
> Adding specialized syntax with the minus sign seems a bit kludgy.
We would do that anyway. The case I am thinking about is where
Rpackages.site includes a lot of packages, and for this project I want to
exclude just one. Then a .Rpackages with `-foo' does the trick.
Brian D. Ripley, email@example.com
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272860 (secr)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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