Add a useful package (from Source forge) for octave

[CreaPhase.git] / octave_packages / tsa-4.2.4 / rc2poly.m

diff --git a/octave_packages/tsa-4.2.4/rc2poly.m b/octave_packages/tsa-4.2.4/rc2poly.m
new file mode 100644 (file)
index 0000000..75a2b42
--- /dev/null
+++ b/octave_packages/tsa-4.2.4/rc2poly.m
@@ -0,0 +1,48 @@
+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 9609 2012-02-10 10:18:00Z schloegl $
+%       Copyright (C) 1998-2002,2008,2012 by Alois Schloegl <alois.schloegl@ist.ac.at>
+%       This is part of the TSA-toolbox. See also 
+%       http://pub.ist.ac.at/~schloegl/matlab/tsa/
+%       http://octave.sourceforge.net/
+%       http://biosig.sourceforge.net/
+%
+%    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);