has_devel.install_version(package, version = NULL,
repos = getOption("repos"),
type = getOption("pkgType"), ...)install. Otherwise,
it looks at the list of archived source tarballs and
tries to iinstall."http://cran.us.r-project.org". Can be NULL to install from local files (with
extension
Possible values are "source",
"mac.binary.leopard" and "win.binary": the
binary types can be listed and downloaded but not
installed on ot
install,
install_bitbucket,
install_git, install_github,
install_gitorious,
install_url