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1 /* |
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2 |
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3 Copyright (C) 1997, 1998, 2000, 2002, 2007 John W. Eaton |
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4 |
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5 This file is part of Octave. |
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6 |
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7 Octave is free software; you can redistribute it and/or modify it |
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8 under the terms of the GNU General Public License as published by the |
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9 Free Software Foundation; either version 3 of the License, or (at your |
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10 option) any later version. |
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11 |
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12 Octave is distributed in the hope that it will be useful, but WITHOUT |
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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15 for more details. |
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16 |
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17 You should have received a copy of the GNU General Public License |
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18 along with Octave; see the file COPYING. If not, see |
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19 <http://www.gnu.org/licenses/>. |
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20 |
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21 */ |
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22 |
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23 #include <octave/oct.h> |
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24 |
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25 DEFUN_DLD (oregonator, args, , |
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26 "The `oregonator'.\n\ |
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27 \n\ |
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28 Reference:\n\ |
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29 \n\ |
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30 Oscillations in chemical systems. IV. Limit cycle behavior in a\n\ |
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31 model of a real chemical reaction. Richard J. Field and Richard\n\ |
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32 M. Noyes, The Journal of Chemical Physics, Volume 60 Number 5,\n\ |
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33 March 1974.") |
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34 { |
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35 ColumnVector dx (3); |
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36 |
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37 ColumnVector x (args(0).vector_value ()); |
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38 |
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39 dx(0) = 77.27 * (x(1) - x(0)*x(1) + x(0) - 8.375e-06*pow (x(0), 2.0)); |
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40 dx(1) = (x(2) - x(0)*x(1) - x(1)) / 77.27; |
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41 dx(2) = 0.161*(x(0) - x(2)); |
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42 |
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43 return octave_value (dx); |
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44 } |
