

   RReeaall VVeeccttoorrss

        real(length = 0)
        as.real(x)
        is.real(x)

   DDeessccrriippttiioonn::

        `real' creates a double precision vector of the speci-
        fied length. Each element of the vector is equal to
        `0'.

        `as.real' attempts to coerce its argument to be of real
        type.

        `is.real' returns `TRUE' or `FALSE' depending on
        whether its argument is of real type or not.

   NNoottee::

        R has no single precision data type.  All real numbers
        are stored in double precision format.

