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function [ PREVIOUS ] = generate_previous(Lh)
###########################################################################
# Copyright (C) 2008 by Piotr Krysik #
# pkrysik@stud.elka.pw.edu.pl #
# #
# 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, write to the #
# Free Software Foundation, Inc., #
# 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. #
###########################################################################
SYMBOLS_NUM = 2**(Lh+1);
n=1;
for i=1:4:SYMBOLS_NUM,
PREVIOUS(i,1) = n+1;
PREVIOUS(i,2) = n+SYMBOLS_NUM/2+1;
PREVIOUS(i+1,1) = n;
PREVIOUS(i+1,2) = n+SYMBOLS_NUM/2;
PREVIOUS(i+2,1) = n+1;
PREVIOUS(i+2,2) = n+SYMBOLS_NUM/2+1;
PREVIOUS(i+3,1) = n;
PREVIOUS(i+3,2) = n+SYMBOLS_NUM/2;
n=n+2;
end
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