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),一种噪声辅助数据分析方法,关于小波的matlab复合分析，有PMUSIC 校正前和校正后的比较，使用大量的有限元法求解偏微分方程，最小均方误差（MMSE）的算法。
English Description：
This function is used to calculate the first order partial derivatives of a function (method), a method of secondary data analysis of noise, on MATLAB Wavelet analysis of composite, PMUSIC calibration before and after correction, using a large number of the finite element method for solving partial differential equations, minimum mean square error (MMSE) algorithm.