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function L = chol_super (A,s)
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%CHOL_SUPER left-looking "supernodal" 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,k) = chol (A (k,k) - L (k,1:k1-1) * L (k,1:k1-1)')' ;
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L (k2:n,k) = (A (k2:n,k) - L (k2:n,1:k1-1) * L (k,1:k1-1)') / L (k,k)' ;