--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main/signal/inst/downsample.m	Sat Jan 20 09:52:48 2007 +0000
@@ -0,0 +1,37 @@
+## Copyright (C) 2007   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 2 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, write to the Free Software
+## Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+## -*- texinfo -*-
+## @deftypefn {Function File} {[@var{y}] =} downsample(@var{x},@var{n})
+##	Build the vector y by keeping only nth sample of x. x can be a vector or a matrix.
+## @end deftypefn
+
+
+function [y] = downsample(x,n)
+	if (nargin < 2); usage('downsample(x,n)'); end
+
+	if(isvector(x))
+		k = 1:n:length(x);
+		y = x(k);
+	else
+		if(ismatrix(x))
+			k = 1:n:length(x);
+			s = size(x,2);
+			i = 1:s;
+			y(:,i) = x(k,i);
+		end
+	end
+endfunction
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