

   DDooccuummeennttaattiioonn

        help(topic, offline = FALSE, package = c(.packages(), .Autoloaded),
             lib.loc = .lib.loc, verbose = .Options$verbose,
              htmlhelp = .Options$htmlhelp)
        ?topic

   AArrgguummeennttss::

      topic: a name or character string on which documentation
             is sought (but not a variable containing a charac-
             ter string!).

    offline: a logical indicating whether documentation should
             be displayed on-line to the screen (the default)
             or hardcopy of it should be produced.

    package: a name or character vector giving the packages to
             look into for documentation.  By default, all
             packages in the search path are used.

    lib.loc: A character vector of directory names of R
             libraries.  Defaults to all libraries currently
             known.

    verbose: logical; if `TRUE', the file name is reported.

   htmlhelp: logical (or `NULL').  If `TRUE' (which is the
             default after `help.start' has been called), the
             HTML version of the help will be shown in a
             browser.

   DDeessccrriippttiioonn::

        These functions provide access to documentation.  Docu-
        mentation on a topic with name `name' (typically, an R
        object or a data set) can be printed with either
        `help(name)' or `?name'.  In the case of unary and
        binary operators and control-flow special forms, the
        name may need to be be quoted.

        If `offline' is `TRUE', hardcopy of the documentation
        is produced by running the LaTeX version of the help
        page through `latex' (note that LaTeX 2e is needed) and
        `dvips'.  Depending on your `dvips' configuration,
        hardcopy will be sent to the printer or saved in a
        file.  If the programs are in non-standard locations
        and hence were not found at compile time, you can
        either set the options `latexcmd' and `dvipscmd', or
        the environment variables `R_LATEXCMD' and `R_DVIPSCMD'
        appropriately.  The appearance of the output can be
        customized through a file `Rhelp.cfg' somewhere in your
        LaTeX search path.

   NNoottee::

        The help files can be many small files. On some file
        systems it is desirable to save space, and the text
        files in the `help' directory of an installed package
        can be zipped up as a zip archive `Rhelp.zip'. Ensure
        the files `AnIndex' and `00Titles' remain un-zipped.
        Similarly, all the files in the `latex' directory can
        be zipped to `Rhelp.zip'.

   SSeeee AAllssoo::

        `help.start()' which opens the HTML version of the R
        Manual; `library()' for listing available packages and
        the user-level objects they contain; `data()' for list-
        ing available data sets; `methods()'.

        See `prompt()' to get a prototype for writing `help'
        pages of private packages.

   EExxaammpplleess::

        help()
        help(help)          # the same

        help(lapply)
        ?lapply             # the same

        help("for")         # or ?"for", but the quotes are needed
        ?"+"

        help(package = stepfun)  # get help even when it's not present

        data()              # list all available data sets
        ?women              # information about data set "women"

        topi <- "women"
        help(topi) ##--> Error: No documentation for `topi'

