/usr/share/octave/packages/tsa-4.3.3/ac2poly.m is in octave-tsa 4.3.3-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 39 40 | function [A,E] = ac2poly(acf);
% converts the autocorrelation sequence into an AR polynomial
% [A,Efinal] = ac2poly(r)
%
% see also ACOVF ACORF AR2RC RC2AR DURLEV AC2POLY, POLY2RC, RC2POLY, RC2AC, AC2RC, POLY2AC
%
% $Id: ac2poly.m 12766 2015-04-02 10:00:34Z schloegl $
% Copyright (C) 1998-2002,2008 by Alois Schloegl <alois.schloegl@gmail.com>
%
% 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/>.
if all(size(acf))>1,
fprintf(2,'Error AC2POLY: "r" must be a vector\n');
return;
end;
mfilename='AC2POLY';
if ~exist('durlev','file')
fprintf(2,'Error %s: DURLEV.M not found. \n Download TSA toolbox from http://pub.ist.ac.at/~schloegl/matlab/tsa/\n',mfilename);
return;
end;
[AR,RC,PE] = durlev(acf);
A = [ones(size(AR,1),1),-AR];
E = PE(:,size(PE,2));
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