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

[Uwe Ligges]

You can only expect that update / reinstall a ***package*** works if you 
have not yet loaded it into your R session.
Hence close R, start it without loading the relevant package and then 
update/reinstall.

Best,
Uwe Ligges


Talbot Katz wrote:
> 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!
> 
> 
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