

   DDaattaa FFrraammee ttoo NNuummeerriicc MMaattrriixx

        data.matrix(frame)

   AArrgguummeennttss::

      frame: a data frame whose components are either logical
             vectors, factors or numeric vectors.

   VVaalluuee::

        The matrix obtained by converting all the variables in
        a data frame to numeric mode and then binding them
        together as the columns of a matrix.  Factors and
        ordered factors are replaced by their codes.

   SSeeee AAllssoo::

        `as.matrix', `codes', `data.frame', `matrix'.

