/usr/share/octave/packages/3.2/tsa-4.1.0/rc2poly.m is in octave-tsa 4.1.0+svn20110501-1.
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 41 42 43 44 | function [a,efinal] = rc2poly(RC,E);
% converts reflection coefficients into an AR-polynomial
% [a,efinal] = rc2poly(K)
%
% see also ACOVF ACORF AR2RC RC2AR DURLEV AC2POLY, POLY2RC, RC2POLY, RC2AC, AC2RC, POLY2AC
%
% $Id: rc2poly.m 5090 2008-06-05 08:12:04Z 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/>.
if nargout>1 & nargin<2
fprintf('Zero-lag autocorrelation, R0 not specified\n')
return;
end;
mfilename='RC2POLY';
if all(size(RC))>1,
fprintf(2,'Error %s: "K" must be a vector\n',mfilename);
return;
end;
if ~exist('rc2ar','file')
fprintf(2,'Error %s: RC2AR.M not found. \n Download TSA toolbox from http://www.dpmi.tu-graz.ac.at/~schloegl/matlab/tsa/\n',mfilename);
return;
end;
[AR,RC,PE] = rc2ar(RC(:).');
a=[1,-AR];
efinal=PE(length(PE))/PE(1);
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