lineoptimizergold2< LNPATH, T > Class Template Reference

Minimize fn on a 1D path in N dimensional space. More...

#include <lineoptimizergold2.h>

Inheritance diagram for lineoptimizergold2< LNPATH, T >:

Collaboration diagram for lineoptimizergold2< LNPATH, T >:

List of all members.

Public Member Functions
	lineoptimizergold2 (LNPATH linepath_)
ostream &	print (ostream &os) const
	Printing the objects state.
void	printstate () const
	Print out the four consecutive positions and their values.
void	reset (T const t0, T const t1)
	Search interval initialized.
void	resetInnerTwoPoints ()
	Do not re-evaluate the end points.
void	operator++ ()
	One iteration of the line minimization algorithm.
bool const	verify () const
	Make sure the ti[ai[]] are consecutive (monotonic).
T const	minimumrealize ()
	Realize the minimum state by setting xi to the lowest state.
Public Attributes
LNPATH	linepath
	This is a path in 1D though N dimensional space.
T	ti [4]
	The t values on the line correspond to index positions.
T	fti [4]
	The value of the function at the index position.
uint	ai [4]
	Indexes to vectors.
T	lengthgold
	Interval length*goldratio.
Static Public Attributes
static T	goldratio
	The client could assign the golden ratio themselves if needed.

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Detailed Description

template<typename LNPATH, typename T>
class lineoptimizergold2< LNPATH, T >

Minimize fn on a 1D path in N dimensional space.

A linear line minimization algorithm. The golden ratio is used to choose the next best interval point.

Usage

Construct the optimizer. Realize the initial position x0 and direction in memory.

Call reset(...) before executing the minimizer. This initializes the interval.

You can reuse the optimizer by writing to the direction and initial position and calling reset.

Example

  double d1[] = {0.0,1.0,1.0};
  double x0[] = {0.0,0.0,0.0};
  parab2 fn;
  typedef linepathd1<parab2&,double*,double*,double> lpth;
  lineoptimizergold2<lpth,double> 
    opt( lpth(3,fn,fn.xi,x0,d1) );

  opt.reset(0.0,5.0);
  for (uint i=0; i<10; ++i)
  {
    ++opt;
    opt.printstate();
  }

Definition at line 47 of file lineoptimizergold2.h.

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Constructor & Destructor Documentation

template<typename LNPATH, typename T>

lineoptimizergold2< LNPATH, T >::lineoptimizergold2

(

LNPATH

linepath_

)

[inline]

Definition at line 70 of file lineoptimizergold2.h.

                                        :
    linepath(linepath_) {}

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Member Function Documentation

template<typename LNPATH, typename T>

T const lineoptimizergold2< LNPATH, T >::minimumrealize

(

)

Realize the minimum state by setting xi to the lowest state.

template<typename LNPATH, typename T>

void lineoptimizergold2< LNPATH, T >::operator++

(

)

One iteration of the line minimization algorithm.

Reimplemented in lineoptimizerparabola< LNPATH, T >.

template<typename LNPATH, typename T>

ostream& lineoptimizergold2< LNPATH, T >::print

(

ostream &

os

)

const

Printing the objects state.

Referenced by lineoptimizergold2< LNPATH, T >::print().

template<typename LNPATH, typename T>

void lineoptimizergold2< LNPATH, T >::printstate

(

)

const

Print out the four consecutive positions and their values.

template<typename LNPATH, typename T>

void lineoptimizergold2< LNPATH, T >::reset	(	T const	t0,
		T const	t1
	)

Search interval initialized.

template<typename LNPATH, typename T>

void lineoptimizergold2< LNPATH, T >::resetInnerTwoPoints

(

)

Do not re-evaluate the end points.

Generally for derived classes.

template<typename LNPATH, typename T>

bool const lineoptimizergold2< LNPATH, T >::verify

(

)

const

Make sure the ti[ai[]] are consecutive (monotonic).

Referenced by lineoptimizergold2< LNPATH, T >::operator++().

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Member Data Documentation

template<typename LNPATH, typename T>

uint lineoptimizergold2< LNPATH, T >::ai[4]

Indexes to vectors.

Definition at line 61 of file lineoptimizergold2.h.

Referenced by lineoptimizergold2< LNPATH, T >::operator++(), lineoptimizergold2< LNPATH, T >::print(), lineoptimizergold2< LNPATH, T >::printstate(), lineoptimizergold2< LNPATH, T >::reset(), lineoptimizergold2< LNPATH, T >::resetInnerTwoPoints(), and lineoptimizergold2< LNPATH, T >::verify().

template<typename LNPATH, typename T>

T lineoptimizergold2< LNPATH, T >::fti[4]

The value of the function at the index position.

Definition at line 58 of file lineoptimizergold2.h.

Referenced by lineoptimizergold2< LNPATH, T >::minimumrealize(), lineoptimizergold2< LNPATH, T >::operator++(), lineoptimizergold2< LNPATH, T >::print(), lineoptimizergold2< LNPATH, T >::printstate(), lineoptimizergold2< LNPATH, T >::reset(), and lineoptimizergold2< LNPATH, T >::resetInnerTwoPoints().

template<typename LNPATH, typename T>

T lineoptimizergold2< LNPATH, T >::goldratio [static]

The client could assign the golden ratio themselves if needed.

Definition at line 67 of file lineoptimizergold2.h.

Referenced by lineoptimizergold2< LNPATH, T >::operator++(), lineoptimizergold2< LNPATH, T >::print(), lineoptimizergold2< LNPATH, T >::reset(), and lineoptimizergold2< LNPATH, T >::resetInnerTwoPoints().

template<typename LNPATH, typename T>

T lineoptimizergold2< LNPATH, T >::lengthgold

Interval length*goldratio.

Definition at line 64 of file lineoptimizergold2.h.

Referenced by lineoptimizergold2< LNPATH, T >::operator++(), lineoptimizergold2< LNPATH, T >::reset(), and lineoptimizergold2< LNPATH, T >::resetInnerTwoPoints().

template<typename LNPATH, typename T>

LNPATH lineoptimizergold2< LNPATH, T >::linepath

This is a path in 1D though N dimensional space.

Definition at line 52 of file lineoptimizergold2.h.

Referenced by lineoptimizergold2< LNPATH, T >::minimumrealize(), lineoptimizergold2< LNPATH, T >::operator++(), lineoptimizergold2< LNPATH, T >::reset(), and lineoptimizergold2< LNPATH, T >::resetInnerTwoPoints().

template<typename LNPATH, typename T>

T lineoptimizergold2< LNPATH, T >::ti[4]

The t values on the line correspond to index positions.

Definition at line 55 of file lineoptimizergold2.h.

Referenced by lineoptimizergold2< LNPATH, T >::minimumrealize(), lineoptimizergold2< LNPATH, T >::operator++(), lineoptimizergold2< LNPATH, T >::print(), lineoptimizergold2< LNPATH, T >::printstate(), lineoptimizergold2< LNPATH, T >::reset(), lineoptimizergold2< LNPATH, T >::resetInnerTwoPoints(), and lineoptimizergold2< LNPATH, T >::verify().

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The documentation for this class was generated from the following file:

• patternsearch/lineoptimizergold2.h