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说明：  雅克比迭代求解线性方程组课设,是学习PCA特征提取的很好的学习资料，利用最小二乘法进行拟合多元非线性方程。
( Jacobi iteration for solving linear equations class-based, Is a good learning materials to learn PCA feature extraction, Multivariate least squares fitting method of nonlinear equations.)