needs loads and attaches packages, automatically
installing (and attaching) any it can't find in your libraries. It accepts
any number of arguments, given as names or character strings. Optionally,
supply a minimum version on a per-package basis to update old packages as
needs(..., .printConflicts = F)
Packages, given as unquoted names or character strings. Specify a
required package version as package = "version".
Logical, specifying whether to print a summary of
objects that exist in multiple places on the search path along with their
respective locations. Set to TRUE to identify any masked functions.
Objects in the base package and the global environment are ignored.
Defaults to FALSE.
Recommended use is to allow the function to autoload when prompted
the first time the package is loaded interactively. To change this setting
later, run needs:::autoload(TRUE) or needs:::autoload(FALSE)
to turn autoloading on or off, respectively.