[R] Failure loading library into second R 2.3.1 session on Windows XP

[Talbot Katz]

Hi.

I am using R 2.3.1 on Windows XP.  I had installed a library package into my 
first session and wanted the same package in my second session, so I went 
out to the CRAN mirror and tried to install the package, and got the 
following message:

*********************************************************************

>utils:::menuInstallPkgs()
trying URL 
'http://cran.ssds.ucdavis.edu/bin/windows/contrib/2.3/corpcor_1.4.4.zip'
Content type 'application/zip' length 133068 bytes
opened URL
downloaded 129Kb

package 'corpcor' successfully unpacked and MD5 sums checked
Warning: cannot remove prior installation of package 'corpcor'

The downloaded packages are in
        C:\Documents and Settings\Talbot\Local 
Settings\Temp\RtmplCxarb\downloaded_packages
updating HTML package descriptions
>library(corpcor)
Error in library(corpcor) : there is no package called 'corpcor'

*********************************************************************


After rebooting my machine, I dug into this a little further.  Upon 
installing a package from a CRAN mirror, it seems to stay on my hard drive, 
and I can load it in subsequent sessions from the "Load package..." menu 
without going back to get it from a CRAN mirror.  However, if I do happen to 
retrieve it again from a CRAN mirror, it appears that may corrupt the 
version that was saved, and it no longer will be available from the "Load 
package..." menu.  A reboot and re-retrieval of the package makes it 
available again; I don't know whether there's any less drastic solution.

This behavior doesn't occur with every package, but I have experienced it 
with two different packages (corpcor and copula), so there seems to be 
something going on.  I didn't see anything in the FAQ page about this, I 
wonder if anyone can tell me more about this issue.

Thanks!


--  TMK  --
212-460-5430	home
917-656-5351	cell