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),pwm整流器的建模仿真，具有丰富的参数选项,大学数值分析算法，D-S证据理论数据融合，matlab编写的元胞自动机。
English Description：
This function is used to calculate the first order partial derivatives of a function (method), the modeling and simulation of PWM rectifier with rich options, University of numerical analysis algorithm, d-s evidence theory data fusion, the MATLAB prepared by cellular automata.