说明：  c语言，定义法计算计算Lorenz系统lyapunov指数，结果比较精确！ 可以改为任意3维动力系统的lyapunov指数的计算程序！
(c language, define the method to calculate the Lorenz system lyapunov index, the result is more accurate! Can be changed to any 3-dimensional dynamical systems lyapunov index calculation program!)