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annotate examples/code/oregonator.cc @ 20811:a22d8a2eb0e5

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fix adaptive strategy in ode solvers. * script/ode/ode45.m: remove unused option OutputSave * script/ode/private/integrate_adaptive.m: rewrite algorithm to be more compatible. * script/ode/private/runge_kutta_45_dorpri.m: use kahan summation for time increment.
author Carlo de Falco <carlo.defalco@polimi.it>
date Sun, 11 Oct 2015 18:44:58 +0200
parents c8240a60dd01
children
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1 #include <octave/oct.h>
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2
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3 DEFUN_DLD (oregonator, args, ,
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224e76250443 Use GNU style coding conventions for code in examples/
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4 "The `oregonator'.\n\
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5 \n\
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6 Reference:\n\
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7 \n\
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8 Oscillations in chemical systems. IV. Limit cycle behavior in a\n\
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9 model of a real chemical reaction. Richard J. Field and Richard\n\
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10 M. Noyes, The Journal of Chemical Physics, Volume 60 Number 5,\n\
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11 March 1974.")
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12 {
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13 ColumnVector dx (3);
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14
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15 ColumnVector x (args(0).vector_value ());
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16
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17 dx(0) = 77.27 * (x(1) - x(0)*x(1) + x(0) - 8.375e-06*pow (x(0), 2.0));
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18 dx(1) = (x(2) - x(0)*x(1) - x(1)) / 77.27;
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19 dx(2) = 0.161*(x(0) - x(2));
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20
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21 return octave_value (dx);
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22 }