Having two different versions of a package in the same R installation

I don't know if it would work but a kludgy attempt would be to install lme4 from CRAN, rename the lme4 directory in library to lme4cran; then install lme4 from R-forge and rename the lme4 directory to lme4forge. Then create a script flexible script that would copy one of the directories to a directory called lme4 on the fly. I don't know if it would work, but I just wonder if there would possibly a more elegant way.

Regards
S?ren

-----Original Message-----
From: Greg Snow [mailto:538280 at gmail.com] 
Sent: 2. oktober 2012 22:27
To: S?ren H?jsgaard
Cc: r-help at r-project.org
Subject: Re: [R] Having two different versions of a package in the same R installation

So if you have both loaded in the same instance of R, how will R know which version of lmer or other functions that you want to run?

It seems cleanest to me to have the 2 different instances of R running like you do now.  The other option would be to change all the names (exported ones anyways) in one version and change that package name as well.  Then you would have 2 different package names with different exported function names.

Dear list,

I am making some comparisons of two versions of the lme4 package: The CRAN version and the R-Forge version. For the moment I have two different R installations, each with a different version of lme4. However it would be convenient if I could have the same version within the same R installation such that I can run a code chunk on one lme4 version and immediately after run the same code chunk on another lme4 version. Does anyone know if this is possible?

Best regards
S?ren

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