Abstract
A truncated Newton minimization package, TNPACK, was described in ACM Transactions on Mathematical Software 14 , 1 (Mar. 1992), pp.46–111. 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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