How to plot duffing equation?( Frequency amplitude)

Hi everyone,

I am looking for a MATLAB code for plotting duffing equation.

Duffing equation is as follows:

I want to plot fequency - amplitude plot.

Feel free to ask if you need more information.

Thank you in advance

[BORIS JUNIOR]

je veux le code d'amplitude de l'equation de duffing

Answer 1

[Torsten]

Give values to the parameters of the equation, rewrite the equation as a system of two first-order equations and use ode45 to solve.