Abstract
A new filter-line-search algorithm for unconstrained nonlinear optimization problems is proposed. Based on the filter technique introduced by Fletcher and Leyffer (Math. Program. 91:239–269, 2002) it extends an existing technique of Wachter and Biegler (SIAM J. Comput. 16:1–31, 2005) for nonlinear equality constrained problem to the fully general unconstrained optimization problem. The proposed method, which differs from their approach, does not depend on any external restoration procedure. Global and local quadratic convergence is established under some reasonable conditions. The results of numerical experiments indicate that it is very competitive with the classical line search algorithm.
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