LINDH — Use Lindh’s method for initial guess for Hessian matrix.
LINDH forces the use of R. Lindh’s method for computing the initial guess of the Hessian matrix. This initial guess is needed for quasi-Newton optimizers (such as TRUSTE), CHN methods, and simulated annealing (ANNEAL, TSANNEAL, MANNEAL, and GANNEAL). If LINDH is not specified, a 2-body model is used by default to compute the initial Hessian matrix. Lindh’s method is generally comparable to the 2-body model but may be slightly slower in some cases.
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