Remark on the Updated Truncated Newton Minimization Package, Algorithm 702

A truncated Newton minimization package, TNPACK, was described in ACM Transactions on Mathematical Software (Vol. 18, pp. 46-111) in 1992. Modifications to enhance performance, especially for large-scale minimization of molecular potential functions are described here. They involve three program segments of TNPACK: negative curvature test, modified Cholesky factorization, and line-search stopping rule.

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