Problem
When trying to install any R package on your system, for example:install.packages("proto")Â you get an error like the following:
The downloaded source packages are in?/tmp/Rtmph4YKLX/downloaded_packages?Updating HTML index of packages in '.Library'Warning in install.packages :cannot create file'/opt/POC/lib64/Revo-7.3/R-3.1.1/lib64/R/doc/html/packages.html', reason'Permission denied'
Solution
This error will occur when you do not have the necessary file permissions to be able to write to the current R library folder as the user you are currently logged in as.  You can use the R function '.libPaths()' to both query and change the current location R will use to install new user-contributed libraries.For example:>.libPaths("/home/testuser/Rlib") To change the default location in which to add R user contributed libraries permanently, you can add this to your user-specific .'Rprofile' file or to the system-wide '.Rprofile.site'  in '/usr/lib64/Revo-7.3/R-3.1.1/lib64/R/etc', if you need to change this setting for all of your R users.
