chooseCRANmirror {utils}R Documentation

Select a CRAN Mirror


Interact with the user to choose a CRAN mirror.


chooseCRANmirror(graphics = getOption(""), ind = NULL,
                 useHTTPS = getOption("useHTTPS", TRUE),
                 local.only = FALSE)

getCRANmirrors(all = FALSE, local.only = FALSE)



Logical. If true, use a graphical list: on Windows or the macOS GUI use a list box, and on a Unix-alike use a Tk widget if package tcltk and an X server are available. Otherwise use a text menu.


Optional numeric value giving which entry to select.


Whether to prefer secure mirrors.


Logical, get all known mirrors or only the ones flagged as OK.


Logical, try to get most recent list from the CRAN master or use file on local disk only.


A list of mirrors is stored in file ‘R_HOME/doc/CRAN_mirrors.csv’, but first an on-line list of current mirrors is consulted, and the file copy used only if the on-line list is inaccessible.

This function is called by a Windows GUI menu item and by contrib.url if it finds the initial dummy value of options("repos").

The useHTTPS argument defaults to TRUE. With useHTTPS = TRUE, HTTPS mirrors with mirroring over ssh will be offered in preference to other mirrors (which are listed in a sub-menu). If it is set to FALSE, no secure mirrors will be offered. Choosing a secure mirror provides some guarantees on the identity of the site chosen and so is recommended. (All R builds support downloading from HTTPS sites.)

ind chooses a row in the list of current mirrors, by number. It is best used with local.only = TRUE and row numbers in ‘R_HOME/doc/CRAN_mirrors.csv’.


None for chooseCRANmirror(), this function is invoked for its side effect of updating options("repos").

getCRANmirrors() returns a data frame with mirror information.

See Also

setRepositories, chooseBioCmirror, contrib.url.

[Package utils version 3.4.0 Index]