

   TThhee NNuummbbeerr ooff AArrgguummeennttss ttoo aa FFuunnccttiioonn

        nargs()

   DDeessccrriippttiioonn::

        When used inside a function body, `nargs' returns the
        number of arguments supplied to that function.

   SSeeee AAllssoo::

        `args', `formals' and `sys.call'.

   EExxaammpplleess::

        tst <- function(a, b=3, ...) {nargs()}
        tst() # 0
        tst(clicketyclack) # 1 (even non existing)
        tst(c1,a2,rr3) # 3

        nargs()# not really meaningful

