Let A be an m n matrix with ker A = (0). Suppose that we use

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Let A be an m × n matrix with ker A = (0). Suppose that we use the Gram-Schmidt algorithm to factor A = Q R as in Exercise 5.3.33. Prove that the least squares solution to the linear system Ax = b is found by solving the triangular system Rx = QTb by Back Substitution.
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Applied Linear Algebra

ISBN: 978-0131473829

1st edition

Authors: Peter J. Olver, Cheri Shakiban

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