预报误差法参数辨识-松弛的思想，wolf 方法计算李雅普诺夫指数,该函数用来计算任意函数的一阶偏导数(数值方法)。- Prediction Error Method for Parameter Identification- the idea of relaxation, wolf calculated Lyapunov exponent, This function is used to calculate the arbitrary function of the first order p