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I was taken to the legacy code. Calculations performed procedure called "dynamic expansion", which essentially organizes the rows of Hesse matrix. Ordering algorithm is not clear to me

Row ordering gives a significant boost in speed solutions of equations. Tell me, please, which is why is this effect? Why change the order of rows in the Hessian accelerates calculation?

Thank you!

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What is a "Hesse matrix" ? –  Inquest Feb 7 '13 at 5:45
    
Welcome to math.SE! Please make sure that you completely explain any terms in your question in such a way that it is clear as possible. For example, define any non-standard terms such as "Hesse matrix", and identify what you mean by "the legacy code". –  Ron Gordon Feb 7 '13 at 5:51
    
i mean en.wikipedia.org/wiki/Hessian_matrix –  user1312837 Feb 7 '13 at 5:52

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