Set default CRAN mirror permanent in R

You can set repos in your .Rprofile to restore your choice every time you start R

Edit: to be more precise:

Add

options(repos=structure(c(CRAN="YOUR FAVORITE MIRROR")))

to your .Rprofile

Alternatively, you can set the mirror site-wide in your Rprofile.site. The location of the file is given by ?Startup:

The path of this file is taken from the value of the R_PROFILE environment variable (after tilde expansion). If this variable is unset, the default is R_HOME/etc/Rprofile.site, which is used if it exists (which it does not in a 'factory-fresh' installation).

So do Sys.getenv("R_PROFILE") for the first option, or Sys.getenv("R_HOME") or R.home() for the second option. On macOS, the location of the second is /Library/Frameworks/R.framework/Resources/etc/.

The file may not exist, or you may see the following lines commented out :

# set a CRAN mirror# local({r <- getOption("repos")#       r["CRAN"] <- "http://my.local.cran"#       options(repos=r)})

So remove the comment marks and change "http://my.local.cran" to the correct website, e.g.:

local({r <- getOption("repos")       r["CRAN"] <- "http://cran.r-project.org"       options(repos=r)})