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diff --git a/octave_packages/communications-1.1.1/@galois/diag.m b/octave_packages/communications-1.1.1/@galois/diag.m
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+## 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
+