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Description: An Excel blog for engineers and scientists, and an engineering and science blog for Excel users.

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This post was prompted by a question at the Eng-Tips forum:

LU Decomposition

which asked why Mathcad was generating LU matrices different to those calculated from the basic theory. The short answer was that there is more than one way to do LU decomposition. This post looks at the question in more detail, including examples of the basic procedures, and how and why the variations are used.

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• xmcarreira.com Blog of eng. Xosé Carreira (since 2007)