www.gusucode.com > 时间序列分析工具箱 - tsa源码程序 > tsa/poly2ar.m
function [A] = poly2ar(A); % Converts AR polymials into autoregressive parameters. % Multiple polynomials can be converted. % % function [AR] = poly2ar(A); % % INPUT: % A AR polynomial, each row represents one polynomial % % OUTPUT % AR autoregressive model parameter % % see also ACOVF ACORF DURLEV RC2AR AR2POLY % Version 2.90 % 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); if ~all(A(:,1)==1) fprintf(2,'Warning POLY2AR: input argument might not be an AR-polynom'); end; A = -A(:,2:size(A,2))./A(:,ones(1,size(A,2)-1));