ON_SimpleMinimizer Class Reference

#include <opennurbs_plus.h>

Public Member Functions
	ON_SimpleMinimizer (int dim, const ON_Interval *domain, int max_it, double val_tol, const double *convergence_tol)
virtual	~ON_SimpleMinimizer ()
int	Dimension () const
virtual bool	Ev (const double *params, double *f, double *df, double **ddf) const
	pure virtual More...
int	LineEval (double t, double *f, double *df)
bool	Minimize (const double *seed, double *val, double *params, bool *bError)

Friends
class	CSimpleMinBrent

Detailed Description

ON_SimpleMinimizer should be used as a local minimizer of positive valued G2 functions. It requires first and second derivatives This is a local minimizer. If it hits the edge of the domain and the only way down is out of the domain, it will stop and consider itself successful. Failure means that the iteration count limit was hit and there was no convergence. In that case, the result will be no larger that that of the seed, and may be of use.

Constructor & Destructor Documentation

ON_SimpleMinimizer()

ON_SimpleMinimizer::ON_SimpleMinimizer	(	int	dim,
		const ON_Interval *	domain,
		int	max_it,
		double	val_tol,
		const double *	convergence_tol
	)

Parameters

domain	dim of them
max_it	stop after this many iterations
val_tol	Stop if the function value is below this. If <= 0, only convergence_tol will be used.
convergence_tol	dim of them. Stop if the change from an iteration is within these. Any that is less than ON_EPSILON^2 will be replaced by N_EPSILON^2.

~ON_SimpleMinimizer()

virtual ON_SimpleMinimizer::~ON_SimpleMinimizer ( )

virtual

Member Function Documentation

Dimension()

int ON_SimpleMinimizer::Dimension

(

)

const

Ev()

virtual bool ON_SimpleMinimizer::Ev ( const double *  params, double *  f, double *  df, double **  ddf  ) const

virtual

pure virtual

Parameters

params	dim
f	Function value.
df	First partials. dim of them ort NULL
ddf	Second partials. dim x dim or NULL. If df is NULL, ddf will not be computed.

LineEval()

int ON_SimpleMinimizer::LineEval	(	double	t,
		double *	f,
		double *	df
	)

Minimize()

bool ON_SimpleMinimizer::Minimize	(	const double *	seed,
		double *	val,
		double *	params,
		bool *	bError
	)

If bError is true, val and params will not be filled in. If bError is false, val and params will be filled in with the best result found. In this case, a return of false means that the tolerances were not met.

Parameters

seed	Input. Dim of them
val	Output. Minimum function value found.
params	Output. Dim of them. Parameters of minimum.
bError	Output. If true, then there was a serious problem and the results in val and params are garbage.

Friends And Related Function Documentation

CSimpleMinBrent

friend class CSimpleMinBrent

friend