

   MMiisscceellllaanneeoouuss MMaatthheemmaattiiccaall FFuunnccttiioonnss

        abs(x)
        sqrt(x)

   DDeessccrriippttiioonn::

        These functions compute miscellaneous mathematical
        functions.  The naming follows the standard for com-
        puter languages such as C or Fortran.

   SSeeee AAllssoo::

        `Arithmetic' for simple, `log' for logarithmic, `sin'
        for trigonometric, and `Special' for special mathemati-
        cal functions.

   EExxaammpplleess::

        xx <- -9:9
        plot(xx, sqrt(abs(xx)),  col = "red")
        lines(spline(xx, sqrt(abs(xx)), n=101), col = "pink")

