用于时频分析算法，该函数用来计算任意函数的一阶偏导数(数值方法),采用加权网络中节点强度和权重都是幂率分布的模型。- For time-frequency analysis algorithm, This function is used to calculate the arbitrary function of the first order partial derivative (numerical methods), Using weighted model nodes in the network strength and weight are power law distribution.