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#include <octave/oct.h>
DEFUN_DLD (oregonator, args, ,
"The 'oregonator'.\n\
\n\
Reference:\n\
\n\
Oscillations in chemical systems. IV. Limit cycle behavior in a\n\
model of a real chemical reaction. Richard J. Field and Richard\n\
M. Noyes, The Journal of Chemical Physics, Volume 60 Number 5,\n\
March 1974.")
{
ColumnVector dx (3);
ColumnVector x (args(0).vector_value ());
dx(0) = 77.27 * (x(1) - x(0)*x(1) + x(0) - 8.375e-06*pow (x(0), 2.0));
dx(1) = (x(2) - x(0)*x(1) - x(1)) / 77.27;
dx(2) = 0.161*(x(0) - x(2));
return octave_value (dx);
}
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