4-Least Squares重点
4.1 LEAST SQUARES AND THE NORMAL EQUATIONS¶
4.1.1 Inconsistent systems of equations¶
概念1

概念2 没有解的方程组称为inconsistent。
概念3


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4.2.2 Data linearization¶


4.3 QR FACTORIZATION¶
4.3.1 Gram–Schmidt orthogonalization and least squares¶

full QR factorization:补成方阵





4.3.3 Householder reflectors¶


