/usr/share/octave/packages/tsa-4.2.7/poly2ar.m is in octave-tsa 4.2.7-1build1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 | 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
% $Id: poly2ar.m 11693 2013-03-04 06:40:14Z schloegl $
% Copyright (C) 1998-2002,2008 by Alois Schloegl <a.schloegl@ieee.org>
%
% 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/>.
% 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));
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