duffing方程非线性系统的分析，matlab代码，包括其李雅普诺夫指数求解，相图，混沌等分析，值得学习-duffing equation analysis of nonlinear systems, including its Lyapunov exponent solving the phase diagram, chaos analysis, it is worth learning

扩散方程的lyapunov指数求解，用的是jacobian矩阵方法-Diffusion equation lyapunov exponent solved using a jacobian matrix method