Automated Re-Install of Packages for R 3.0

1. #Get currently installed packages
2. package_df <-as.data.frame(installed.packages("/Library/Frameworks/R.framework/Versions/2.15/Resources/library"))
3. package_list <- as.character(package_df$Package)
4.  
5. #Re-install Install packages
6. install.packages(package_list)
   
   
   you can also use a more direct method:

   update.packages(ask=FALSE, checkBuilt = TRUE)

   from: http://randyzwitch.com/automated-re-install-of-packages-for-r-3-0/