duffing_ode, a Python code which sets up and solves Duffing's second-order ordinary differential equation (ODE) whose solution can exhibit chaotic behavior.
The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.
duffing_ode is available in a MATLAB version and an Octave version and a Python version.
python_ode, Python codes which sets up various systems of ordinary differential equations (ODE).