duffing_ode, an Octave code which sets up and solves Duffing's second-order ordinary differential equation (ODE) whose solution can exhibit chaotic behavior.
The information on this web page is distributed under the MIT license.
duffing_ode is available in a MATLAB version and an Octave version and a Python version.
octave_ode, an Octave code which sets up various ordinary differential equations (ODE).