Interact with the user to choose the package repositories to be used.
setRepositories(graphics = getOption("menu.graphics"),
ind = NULL, addURLs = character())Logical. If true, use a graphical list: on Windows or
macOS GUI use a list box, and on a Unix-alike if tcltk and an X
server are available, use Tk widget. Otherwise use a text
menu.
NULL or a vector of integer indices, which have the
same effect as if they were entered at the prompt for
graphics = FALSE.
A character vector of additional URLs: it is often helpful to use a named vector.
This function is invoked mainly for its side effect of updating
options("repos"). It returns (invisibly) the previous
repos options setting (as a list with component
repos) or NULL if no changes were applied.
The default list of known repositories is stored in the file
R_HOME/etc/repositories.
That file can be edited for a site, or a user can have a personal copy
in the file pointed to by the environment variable
R_REPOSITORIES, or if this is unset or does not exist,
in HOME/.R/repositories, which will take precedence.
A Bioconductor mirror can be selected by setting
options("BioC_mirror"), e.g.via
chooseBioCmirror --- the default value is
"https://bioconductor.org".
The items that are preselected are those that are currently in
options("repos") plus those marked as default in the
list of known repositories.
The list of repositories offered depends on the setting of option
"pkgType" as some repositories only offer a subset of types
(e.g., only source packages or not macOS binary packages).
Further, for binary packages some repositories (notably R-Forge) only
offer packages for the current or recent versions of R.
(Type "both" is equivalent to "source".)
Repository CRAN is treated specially: the value is taken from
the current setting of getOption("repos") if this has an
element "CRAN": this ensures mirror selection is sticky.
This function requires the R session to be interactive unless
ind is supplied.