NAME

       sc::HessianUpdate - The HessianUpdate abstract class is used to specify a hessian update
       scheme.

SYNOPSIS

       #include <update.h>

       Inherits sc::SavableState.

       Inherited by sc::DFPUpdate, and sc::PowellUpdate.

   Public Member Functions
       HessianUpdate (StateIn &)
       HessianUpdate (const Ref< KeyVal > &)
       void save_data_state (StateOut &)
           Save the base classes (with save_data_state) and the members in the same order that
           the StateIn CTOR initializes them.
       virtual void update (const RefSymmSCMatrix &hessian, const Ref< Function > &, const
           RefSCVector &xnew, const RefSCVector &gnew)=0
       virtual void set_inverse ()
       virtual void apply_transform (const Ref< NonlinearTransform > &)

   Protected Attributes
       int inverse_hessian_

   Additional Inherited Members

Detailed Description

       The HessianUpdate abstract class is used to specify a hessian update scheme.

       It is used, for example, by QNewtonOpt objects. Based on the value of inverse_hessian_ x
       and g may be reversed (see Schlegel, Ab initio Methods in Quantum Chemistry I, 1987, p
       10).

Member Function Documentation

   void sc::HessianUpdate::save_data_state (StateOut &) [virtual]
       Save the base classes (with save_data_state) and the members in the same order that the
       StateIn CTOR initializes them. This must be implemented by the derived class if the class
       has data.

       Reimplemented from sc::SavableState.

       Reimplemented in sc::PowellUpdate, sc::BFGSUpdate, and sc::DFPUpdate.

Author

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