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function L = chol_up (A)
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%CHOL_UP up-looking Cholesky factorization.
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% Copyright 2006-2007, Timothy A. Davis.
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% http://www.cise.ufl.edu/research/sparse
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L (k,1:k-1) = (L (1:k-1,1:k-1) \ A (1:k-1,k))' ;
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L (k,k) = sqrt (A (k,k) - L (k,1:k-1) * L (k,1:k-1)') ;