

   NNoott YYeett IImmpplleemmeenntteedd FFuunnccttiioonnss aanndd UUnnuusseedd AArrgguummeennttss

        .NotYetImplemented()
        .NotYetUsed(arg)

        symbols(...)
        plot.lm(...)

   AArrgguummeennttss::

        arg: an argument of a function that is not yet used.

   DDeessccrriippttiioonn::

        In order to pinpoint missing functionality, the R core
        team uses these functions for missing R functions and
        not yet used arguments of existing R functions (which
        are typically there for compatibility purposes).

        You are very welcome to contribute your code ...

   SSeeee AAllssoo::

        the contrary, `Deprecated' and `Defunct' for outdated
        code.

   EExxaammpplleess::

        symbols            # to see how the ``NotYetImplemented''
        .NotYetImplemented      # reference is made automagically

        barplot(1:5, inside = TRUE) # `inside' is not yet used

