--- /dev/null
+## 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 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{w}] =} parzenwin(@var{L})
+## Compute the Parzen window of lenght L.
+## @seealso{rectwin, bartlett}
+## @end deftypefn
+
+function w = parzenwin (L)
+ if(nargin != 1)
+ print_usage;
+ elseif(L < 0)
+ error('L must be positive');
+ end
+
+ if(L ~= floor(L))
+ L = round(L);
+ end
+
+ N = L-1;
+ n = -(N/2):N/2;
+ n1 = n(find(abs(n) <= N/4));
+ n2 = n(find(n > N/4));
+ n3 = n(find(n < -N/4));
+
+ w1 = 1 -6.*(abs(n1)./(L/2)).^2 + 6*(abs(n1)./(L/2)).^3;
+ w2 = 2.*(1-abs(n2)./(L/2)).^3;
+ w3 = 2.*(1-abs(n3)./(L/2)).^3;
+ w = [w3 w1 w2]';
+endfunction