Example ODE System Number Eight
The derivative function of an example two dimensional autonomous ODE system.
Value of t, the independent variable, to evaluate the derivative at. Should be a single number.
Values of x and y, the dependent variables, to evaluate the derivative at. Should be a vector of length 2.
Values of the parameters of the system. Not required here.
Evaluates the derivatives of the following coupled ODE system at the point (t, x, y):
dx/dt = y, dy/dt = -x - y.
Format is designed to be compatible with ode from the deSolve package.
Returns a list dy containing the values of the two derivatives at (t, x, y).
Michael J. Grayling