

   FFaasstt vvaarriiooggrraamm ffoorr rreepplliiccaatteedd ffiieellddss

        vgfast(data)

   AArrgguummeennttss::

       data: A matrix where the columns are different locations
             and the rows are independent realizations of the
             field.

   VVaalluuee::

        A vector of average squared differences

   SSeeee AAllssoo::

        vgram

        }

