how to update installed packages to a new version of R?

Dear Mike,

I've just installed R 1.6.1 and would like to install all the contributed 
packages I had used in 1.5.1.
It's not too hard to do this manually from Rgui, but I wondered if there 
is an easier way,
something like writing the results of installed.packages() from 1.5.1 to a 
file and
using that with install.packages() in 1.6.1, or just having 1.6.1 read 
what's in rw151/library.

What I do is set the environment variable R_LIBS to c:\R\Local (of course, 
you can adjust this to reflect where you want the packages to reside on 
your system). That way, all packages (beyond those in the R distribution) 
get installed in this location. When I install a new version of R, all I 
have to do is update the installed packages (via update.packages on the 
Packages menu in Rgui).

For a start, you could copy all of your current contributed packages to a 
local library directory and proceed as I suggested.

I hope that this help,
  John
____________________________
John Fox
Department of Sociology
McMaster University
email: jfox at mcmaster.ca
web: http://www.socsci.mcmaster.ca/jfox
____________________________

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