[R] Installing packages into updated R

Prof Brian Ripley ripley at stats.ox.ac.uk
Tue Dec 20 17:08:30 CET 2005

This is one reason we normally recommend that you install into a separate 
library.  Then update.packages(checkBuilt = TRUE) is all that is needed.

> foo <- installed.packages()
> as.vector(foo[is.na(foo[, "Priority"]), 1])

will give you a character vector which you can feed to install.packages(), 
so it's not complex to do manually.

On Tue, 20 Dec 2005, Michael H. Prager wrote:

> A minor inconvenience in updating an R installation is remembering which
> packages were installed previously.  Has anyone written a script to
> inspect a previous installation, then get & install the same packages
> into the new installation?

Brian D. Ripley,                  ripley at stats.ox.ac.uk
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 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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