Koper's Extended Van der Pol Model.

The equation-file kpr.f contains the equations

$$\begin{array}{rcl} \dot{x} & = & \epsilon _1^{-1}\:(k\: y - x... ... & x - 2\: y + z \\ \dot{z} & = & \epsilon _2(y-z), \end{array}$$ (23.1)

with $\epsilon _1 =0.1$ and $\epsilon _2=1$ [#!Ko:95!#].

To copy across the demo kpr and compile we type

@dm kpr