--- /dev/null
+## Copyright (C) 2011 David Bateman
+##
+## This program is free software; you can redistribute it and/or modify it under
+## the terms of the GNU General Public License as published by the Free Software
+## Foundation; either version 3 of the License, or (at your option) any later
+## version.
+##
+## This program is distributed in the hope that it will be useful, but WITHOUT
+## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+## FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
+## details.
+##
+## You should have received a copy of the GNU General Public License along with
+## this program; if not, see <http://www.gnu.org/licenses/>.
+
+## -*- texinfo -*-
+## @deftypefn {Loadable Function} {} diag (@var{v}, @var{k})
+## Return a diagonal matrix with Galois vector @var{v} on diagonal @var{k}.
+## The second argument is optional. If it is positive, the vector is placed on
+## the @var{k}-th super-diagonal. If it is negative, it is placed on the
+## @var{-k}-th sub-diagonal. The default value of @var{k} is 0, and the
+## vector is placed on the main diagonal. For example,
+##
+## @example
+## diag (gf([1, 2, 3],2), 1)
+## ans =
+## GF(2^2) array. Primitive Polynomial = D^2+D+1 (decimal 7)
+##
+## Array elements =
+##
+## 0 1 0 0
+## 0 0 2 0
+## 0 0 0 3
+## 0 0 0 0
+## @end example
+## @end deftypefn
+
+function varargout = diag (varargin)
+ varargout = cell (1, max(1, nargout));
+ [varargout{:}] = gdiag (varargin{:});
+endfunction
+