Remove a library from .libPaths() permanently without Rprofile.site - r

Question

How can I permanently remove a library in R?
.libPaths()
[1] "\\\\per-homedrive1.corp.riotinto.org/homedrive$/Tommy.O'Dell/R/win-library/2.15"
[2] "C:/Program Files/R/R-2.15.2/library"
[3] "C:/Program Files/RStudio/R/library"
The first item is my corporate "My Documents" folder, and the apostrophe in the path from my surname is causing all kinds of grief when using R CMD INSTALL --build on a package I'm making, not to mention issues using packages installed there when I'm offline from the network.
I want to use C:/Program Files/R/R-2.15.2/library as the default instead, but I don't want to have to rely on an Rprofile.site.
What I've tried
> .libPaths(.libPaths()[2:3])
> .libPaths()
[1] "C:/Program Files/R/R-2.15.2/library" "C:/Program Files/RStudio/R/library"
That seems to work, but only until I restart my R session, and then I'm back to the original .libPaths() output...
Restarting R session...
> .libPaths()
[1] "\\\\per-homedrive1.corp.riotinto.org/homedrive$/Tommy.O'Dell/R/win-library/2.15"
[2] "C:/Program Files/R/R-2.15.2/library"
[3] "C:/Program Files/RStudio/R/library"
I thought maybe .libPaths() was using R_LIBS_USER
> Sys.getenv("R_LIBS_USER")
[1] "//per-homedrive1.corp.riotinto.org/homedrive$/Tommy.O'Dell/R/win-library/2.15"
So I've tried to unset it using Sys.unsetenv("R_LIBS_USER") but it doesn't persist between sessions.
Additional Info
If it matters, here are some environment variables that might be relevant...
> Sys.getenv("R_HOME")
[1] "C:/PROGRA~1/R/R-215~1.2"
> Sys.getenv("R_HOME")
[1] "C:/PROGRA~1/R/R-215~1.2"
> Sys.getenv("R_USER")
[1] "//per-homedrive1.corp.riotinto.org/homedrive$/Tommy.O'Dell"
> Sys.getenv("R_LIBS_USER")
[1] "//per-homedrive1.corp.riotinto.org/homedrive$/Tommy.O'Dell/R/win-library/2.15"
> Sys.getenv("R_LIBS_SITE")
[1] ""
I've tried Sys.unsetenv("R_LIBS_USER") but this also doesn't stick between sessions

Answer 1

Just set the environment variable R_LIBS in Windows to something like
R_LIBS=C:/Program Files/R/R-2.15.2/library
Restart R.

Answer 2

This is bit late response to the question, but might be useful for others.
I order to set up my own path (and remove one of the original ones) I have:
used .libPaths() inside R to check current library paths;
identified which paths to keep. In my case, it kept R's original library but removed link to my documents.
found R-Home path using R.home() or Sys.getenv("R_HOME");
R-Home\R-3.2.2\etc\Rprofile.site is read every time R kernel starts. Therefore, any modification will be persistent to every run of R.
Edited Rprofile.site by adding the following,
.libPaths(.libPaths()[2])
.libPaths("d:/tmp/R/win-library/3.2")
How it works?
First line remove all but one path (second from the original list), the second line adds an additional path. We end up with two paths.
note that I use Unix path notation despite using windows. R always use Unix notation, regardless of operating system
restarted R (using Ctr+Shift+F10)
This will work every time now.

Answer 3

Use this function in .Rprofile
set_lib_paths <- function(lib_vec) {
lib_vec <- normalizePath(lib_vec, mustWork = TRUE)
shim_fun <- .libPaths
shim_env <- new.env(parent = environment(shim_fun))
shim_env$.Library <- character()
shim_env$.Library.site <- character()
environment(shim_fun) <- shim_env
shim_fun(lib_vec)
}
set_lib_paths("~/code/library") # where "~/code/library" is your package directory
Original Source: https://milesmcbain.xyz/hacking-r-library-paths/

Answer 4

I have put the Sys.unsetenv("R_LIBS_USER") command in a .Rprofile file in my windows "own documents" folder. Seems to help. My problem was that being in an active directory environment made R upstart and package loading incredibly slow when connected via vpn.

Answer 5

If you want to do this at RProfile file (#library/base/R/), you can search the lines where R_LIBS_* environment variables are set (for e.g. Sys.setenv(R_LIBS_SITE=....) and Sys.setenv(R_LIBS_USER=.....))
You can also search the code .libPaths(), which sets the library tree. So you can achieve your goal by a combination of commenting, unsetting and setting the R_LIBS variables before the .libPaths() call as you wish. For e.g. Something like:
Sys.unsetenv("R_LIBS")
Sys.unsetenv("R_LIBS_USER")
Sys.setenv(R_LIBS_SITE = "D:/R/libs/site")
Sys.setenv(R_LIBS_USER = "D:/R/libs/user")
Sys.setenv(R_LIBS = "D:/R/libs")