Talk:LU decomposition: Difference between revisions
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[http://www.wolframalpha.com/input/?i=lu+decomposition+{{1%2C+1%2C+1%2C+1}%2C+{1%2C+1%2C+-1%2C+-1}%2C+{1%2C+-1%2C+0%2C+0}%2C+{0%2C+0%2C+1%2C+-1}}]
The permutation matrix has to be updated at each step, but that will make the code a lot more complicated.
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