function [A] = ar2poly(A);% converts autoregressive parameters into AR polymials % Multiple polynomials can be converted. % function  [A] = ar2poly(AR);%%  INPUT:% AR     AR parameters, each row represents one set of AR parameters%%  OUTPUT% A     denominator polynom%%% see also ACOVF ACORF DURLEV RC2AR FILTER FREQZ ZPLANE% % REFERENCES:%  P.J. Brockwell and R. A. Davis "Time Series: Theory and Methods", 2nd ed. Springer, 1991.%  S. Haykin "Adaptive Filter Theory" 3rd ed. Prentice Hall, 1996.%  M.B. Priestley "Spectral Analysis and Time Series" Academic Press, 1981. %  W.S. Wei "Time Series Analysis" Addison Wesley, 1990.%	Version 2.90	last revision 10.04.2002%	Copyright (C) 1996-2002 by Alois Schloegl <a.schloegl@ieee.org>% This library is free software; you can redistribute it and/or% modify it under the terms of the GNU Library General Public% License as published by the Free Software Foundation; either% Version 2 of the License, or (at your option) any later version.%% This library 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% Library General Public License for more details.%% You should have received a copy of the GNU Library General Public% License along with this library; if not, write to the% Free Software Foundation, Inc., 59 Temple Place - Suite 330,% Boston, MA  02111-1307, USA.% Inititialization[lr,lc]=size(A);A = [ones(size(A,1),1),-A];