包含特征值与特征向量的提取、训练样本以及最后的识别，该函数用来计算任意函数的一阶偏导数(数值方法),基于matlab平台实现。- Contains the eigenvalue and eigenvector extraction, the training sample, and the final recognition, This function is used to calculate the arbitrary function of the first order partial derivative (numerical methods), Based on matlab platform.