利用最小二乘法进行拟合多元非线性方程，包含特征值与特征向量的提取、训练样本以及最后的识别，分数阶傅里叶变换计算方面。- Multivariate least squares fitting method of nonlinear equations, Contains the eigenvalue and eigenvector extraction, the training sample, and the final recognition, Fractional Fourier trans