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diff --git a/octave_packages/communications-1.1.1/intrlv.m b/octave_packages/communications-1.1.1/intrlv.m
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+++ b/octave_packages/communications-1.1.1/intrlv.m
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+## Copyright (C) 2008 Sylvain Pelissier <sylvain.pelissier@gmail.com>
+##
+## 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 {Function File} {@var{intrlvd} =} intrlv (@var{data}, @var{elements})
+## Interleaved elements of @var{data} according to @var{elements}.
+## @seealso{deintrlv}
+## @end deftypefn
+
+function intrlvd = intrlv(data,elements)
+	if(nargin < 2 || nargin >2)
+		error('usage : interlvd = interlv(data,elements)');
+	end
+	
+	if(~isvector(elements))
+		error("Elements must be a vector");
+	end
+	
+	if(isvector(data))
+		if(length(elements) ~= length(data) || any(sort(elements) ~= 1:length(data)))
+			error("elements must be a permutation of data indices");
+		end
+		intrlvd = data(elements);
+	else
+		if(length(elements) ~= size(data,1) || any(sort(elements) ~= 1:size(data,1)))
+			error("elements must be a permutation of data indices");
+		end
+		intrlvd = data(elements,:);
+	end