中文说明：该函数用来计算任意函数的一阶偏导数(数值方法),计算互信息非常有用的一组程序,算法优化非常好，几乎没有循环，从先验概率中采样，计算权重，基于matlab GUI界面设计,用谱方法计算流体力学一些流动现象的整体稳定性。
English Description：
This function is used to calculate the first order partial derivatives of a function (method), computing mutual information very useful set of optimized algorithm very well, almost no loops, sampled from the prior probability, weighted, based on MATLAB GUI interface design method is used to calculate overall stability of fluid flow phenomena.