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sc::DFPUpdate(3)		     MPQC		      sc::DFPUpdate(3)

NAME
       sc::DFPUpdate - The DFPUpdate class is used to specify a	Davidson,
       Fletcher, and Powell hessian update scheme.

SYNOPSIS
       #include	<update.h>

       Inherits	sc::HessianUpdate.

       Inherited by sc::BFGSUpdate.

   Public Member Functions
       DFPUpdate (StateIn &)
       DFPUpdate (const	Ref< KeyVal > &)
	   The KeyVal constructor reads	the following keywords:
       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.
       void update (const RefSymmSCMatrix &ihessian, const Ref<	Function > &,
	   const RefSCVector &xnew, const RefSCVector &gnew)
       void apply_transform (const Ref<	NonlinearTransform > &)
       void set_inverse	()

       Public Member Functions inherited from sc::HessianUpdate
       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 > &)

       Public Member Functions inherited from sc::SavableState
       SavableState & operator=	(const SavableState &)
       void save_state (StateOut &)
	   Save	the state of the object	as specified by	the StateOut object.
       void save_object_state (StateOut	&)
	   This	can be used for	saving state when the exact type of the	object
	   is known for	both the save and the restore.
       virtual void save_vbase_state (StateOut &)
	   Save	the virtual bases for the object.
       virtual 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.

       Public Member Functions inherited from sc::DescribedClass
       DescribedClass (const DescribedClass &)
       DescribedClass &	operator= (const DescribedClass	&)
       ClassDesc * class_desc () const	throw ()
	   This	returns	the unique pointer to the ClassDesc corresponding to
	   the given type_info object.
       const char * class_name () const
	   Return the name of the object's exact type.
       int class_version () const
	   Return the version of the class.
       virtual void print (std::ostream	&=ExEnv::out0()) const
	   Print the object.

       Public Member Functions inherited from sc::RefCount
       int lock_ptr () const
	   Lock	this object.
       int unlock_ptr () const
	   Unlock this object.
       void use_locks (bool inVal)
	   start and stop using	locks on this object
       refcount_t nreference ()	const
	   Return the reference	count.
       refcount_t reference ()
	   Increment the reference count and return the	new count.
       refcount_t dereference ()
	   Decrement the reference count and return the	new count.
       int managed () const
       void unmanage ()
	   Turn	off the	reference counting mechanism for this object.
       int managed () const
	   Return 1 if the object is managed. Otherwise	return 0.

       Public Member Functions inherited from sc::Identity
       Identifier identifier ()
	   Return the Identifier for this argument.

   Protected Attributes
       RefSCVector xprev
       RefSCVector gprev

       Protected Attributes inherited from sc::HessianUpdate
       int inverse_hessian_

   Additional Inherited	Members
       Static Public Member Functions inherited	from sc::SavableState
       static void save_state (SavableState *s,	StateOut &)
       static SavableState * restore_state (StateIn &si)
	   Restores objects saved with save_state.
       static SavableState * key_restore_state (StateIn	&si, const char
	   *keyword)
	   Like	restore_state, but keyword is used to override values while
	   restoring.
       static SavableState * dir_restore_state (StateIn	&si, const char
	   *objectname,	const char *keyword=0)

       Protected Member	Functions inherited from sc::SavableState
       SavableState (const SavableState	&)
       SavableState (StateIn &)
	   Each	derived	class StateIn CTOR handles the restore corresponding
	   to calling save_object_state, save_vbase_state, and save_data_state
	   listed above.

       Protected Member	Functions inherited from sc::RefCount
       RefCount	(const RefCount	&)
       RefCount	& operator= (const RefCount &)

Detailed Description
       The DFPUpdate class is used to specify a	Davidson, Fletcher, and	Powell
       hessian update scheme.

Constructor & Destructor Documentation
   sc::DFPUpdate::DFPUpdate (const Ref<	KeyVal > &)
       The KeyVal constructor reads the	following keywords:

       xprev
	   The previous	coordinates can	be given (but is not recommended). The
	   default is none.

       gprev
	   The	previous  gradient  can	be given (but is not recommended). The
	   default is none.

Member Function	Documentation
   void	sc::DFPUpdate::apply_transform (const  Ref<  NonlinearTransform	 >  &)
       [virtual]
       Reimplemented from sc::HessianUpdate.

   void	sc::DFPUpdate::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::HessianUpdate.

       Reimplemented in	sc::BFGSUpdate.

   void	sc::DFPUpdate::set_inverse () [virtual]
       Reimplemented from sc::HessianUpdate.

   void	 sc::DFPUpdate::update	(const	RefSymmSCMatrix	& ihessian, const Ref<
       Function	> &, const RefSCVector	&  xnew,  const	 RefSCVector  &	 gnew)
       [virtual]
       Implements sc::HessianUpdate.

Author
       Generated automatically by Doxygen for MPQC from	the source code.

Version	2.3.1			Tue May	13 2025		      sc::DFPUpdate(3)

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