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1 function [A] = poly2ar(A); |
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2 % Converts AR polymials into autoregressive parameters. |
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3 % Multiple polynomials can be converted. |
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4 % |
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5 % function [AR] = poly2ar(A); |
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6 % |
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7 % INPUT: |
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8 % A AR polynomial, each row represents one polynomial |
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9 % |
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10 % OUTPUT |
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11 % AR autoregressive model parameter |
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12 % |
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13 % see also ACOVF ACORF DURLEV RC2AR AR2POLY |
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14 |
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15 % $Id$ |
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16 % Copyright (C) 1998-2002,2008 by Alois Schloegl <alois.schloegl@gmail.com> |
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17 % |
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18 % This program is free software: you can redistribute it and/or modify |
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19 % it under the terms of the GNU General Public License as published by |
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20 % the Free Software Foundation, either version 3 of the License, or |
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21 % (at your option) any later version. |
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22 % |
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23 % This program is distributed in the hope that it will be useful, |
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24 % but WITHOUT ANY WARRANTY; without even the implied warranty of |
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25 % MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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26 % GNU General Public License for more details. |
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27 % |
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28 % You should have received a copy of the GNU General Public License |
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29 % along with this program. If not, see <http://www.gnu.org/licenses/>. |
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30 |
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31 % Inititialization |
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32 [lr,lc]=size(A); |
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33 |
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34 if ~all(A(:,1)==1) |
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35 fprintf(2,'Warning POLY2AR: input argument might not be an AR-polynom'); |
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36 end; |
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37 |
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38 A = -A(:,2:size(A,2))./A(:,ones(1,size(A,2)-1)); |
