function  [AR,RC] = arcext(MX,P);% ARCEXT extracts AR and RC of order P from Matrix MX% function  [AR,RC] = arcext(MX,P);%%  INPUT:% MX 	AR and RC matrix calculated by durlev % P 	model order (default maximum possible)%%  OUTPUT% AR    autoregressive model parameter	% RC    reflection coefficients (= -PARCOR coefficients)%% All input and output parameters are organized in rows, one row % corresponds to the parameters of one channel%% see also ACOVF ACORF DURLEV % % 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.%  $Revision: 1.8 $%  $Id: arcext.m,v 1.8 2003/03/07 23:20:49 schloegl Exp $%  Copyright (C) 1998-2003 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.[lr,lc]=size(MX);if ~mod(sqrt(8*lc+1)-1,2)	% full number of elements	K = (sqrt(8*lc+1)-1)/2;elseif ~mod(lc,2),   % compressed form of MX	K = lc/2;else		% invalid number of elements	fprintf(2,'Warning ARCEXT: Number of elements is different than a triangular matrix\n');end;[K,P,lc]if (K~=P) & (lc~=K*(K+1)/2),	[AR,RC,PE]=rc2ar(MX(:,(1:P).*(2:P+1)/2));else	AR = MX(:,P*(P-1)/2+(1:P));	RC = MX(:,(1:P).*(2:P+1)/2);end;