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),汽车课设货车Matlab驱动力图程序，通过反复训练模板能有较高的识别率，未来线路预测,分析误差,遗传算法无功优化，关于小波的matlab复合分析。
English Description：
The function is used to calculate the first order partial derivative of any function (numerical method). The automobile course sets up the MATLAB driver program for freight cars. Through repeated training of the template, it can have higher recognition rate, future line prediction, analysis error, genetic algorithm reactive power optimization, and MATLAB complex analysis of wavelet.