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December 15, 2015 20:48
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On a Mac OS, re-install R packages installed for R 2.15.X, when upgrading to R 3.0.0
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| # http://randyzwitch.com/automated-re-install-of-packages-for-r-3-0/ | |
| # if using RStudio, make sure to unload all packages that are pre-loaded except for utils: | |
| # we have to use the install.packages() function in utils for the re-installation | |
| # Get currently installed packages | |
| package_df <- as.data.frame(installed.packages("/Library/Frameworks/R.framework/Versions/2.15/Resources/library")) | |
| package_list <- as.character(package_df$Package) | |
| package_list # get a package list installed on R 2.15.X | |
| length(package_list) | |
| # Re-install Install packages | |
| install.packages(package_list) |
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