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gu-mi/update_R_pkgs.R

Last active 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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update_R_pkgs.R
# 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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