NITSOL - A NEWTON ITERATIVE SOLVER FOR NONLINEAR-SYSTEMS

We introduce a well-developed Newton iterative (truncated Newton) algo rithm for solving large-scale nonlinear systems. The framework is an i nexact Newton method globalized by backtracking. Trial steps are obtai ned using one of several Krylov subspace methods. The algorithm is imp lemented in a Fortran solver called NITSOL that is robust yet easy to use and provides a number of useful options and features. The structur e offers the user great flexibility in addressing problem specificity through preconditioning and other means and allows easy adaptation to parallel environments. Features and capabilities are illustrated in nu merical experiments.