Which is the more efficient algorithm: direct least squares based on solving the normal equations by Gaussian

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Which is the more efficient algorithm: direct least squares based on solving the normal equations by Gaussian Elimination, or using Gram-Schmidt orthonormalization and then solving the resulting triangular system by Back Substitution as in Exercise 5.5.22? Justify= your answer.
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Applied Linear Algebra

ISBN: 978-0131473829

1st edition

Authors: Peter J. Olver, Cheri Shakiban

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