实现一列时间序列的峰峰间隔，很好用，欢迎补充。(To achieve a time series of peak-to-peak spacing)

一种求lyapunov指数的算法，可以参考，不同系统，参数不同(We present the first algorithms that allow the estimation of non-negative Lyapunov exponents from an experimental time series.)

最基本的解常微分方程的方法，包括欧拉法、泰勒级数法、多步法、隐式法、Rung-kutta法等(The basic methods for solving ordinary differential equations include Euler method, Taylor series method, multistep method, implicit method, Rung-kutta method, etc.)