org.apache.commons.math3.optimization.univariate

Class BracketFinder

java.lang.Object

org.apache.commons.math3.optimization.univariate.BracketFinder

Deprecated.

As of 3.1 (to be removed in 4.0).

@Deprecated
public class BracketFinder
extends java.lang.Object

Provide an interval that brackets a local optimum of a function. This code is based on a Python implementation (from SciPy, module optimize.py v0.5).

Since:

2.2

Field Summary

Fields

Modifier and Type	Field and Description
private static double	EPS_MIN Deprecated. Tolerance to avoid division by zero.
private Incrementor	evaluations Deprecated. Counter for function evaluations.
private double	fHi Deprecated. Function value at hi.
private double	fLo Deprecated. Function value at lo.
private double	fMid Deprecated. Function value at mid.
private static double	GOLD Deprecated. Golden section.
private double	growLimit Deprecated. Factor for expanding the interval.
private double	hi Deprecated. Higher bound of the bracket.
private double	lo Deprecated. Lower bound of the bracket.
private double	mid Deprecated. Point inside the bracket.

Constructor Summary

Constructors

Constructor and Description
BracketFinder() Deprecated. Constructor with default values 100, 50 (see the other constructor).
BracketFinder(double growLimit, int maxEvaluations) Deprecated. Create a bracketing interval finder.

Method Summary

Methods

Modifier and Type	Method and Description
private double	eval(UnivariateFunction f, double x) Deprecated.
int	getEvaluations() Deprecated.
double	getFHi() Deprecated. Get function value at getHi().
double	getFLo() Deprecated. Get function value at getLo().
double	getFMid() Deprecated. Get function value at getMid().
double	getHi() Deprecated.
double	getLo() Deprecated.
int	getMaxEvaluations() Deprecated.
double	getMid() Deprecated.
void	search(UnivariateFunction func, GoalType goal, double xA, double xB) Deprecated. Search new points that bracket a local optimum of the function.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

EPS_MIN

private static final double EPS_MIN

Deprecated.

Tolerance to avoid division by zero.

See Also:

Constant Field Values

GOLD

private static final double GOLD

Deprecated.

Golden section.

See Also:

Constant Field Values

growLimit

private final double growLimit

Deprecated.

Factor for expanding the interval.

evaluations

private final Incrementor evaluations

Deprecated.

Counter for function evaluations.

lo

private double lo

Deprecated.

Lower bound of the bracket.

hi

private double hi

Deprecated.

Higher bound of the bracket.

mid

private double mid

Deprecated.

Point inside the bracket.

fLo

private double fLo

Deprecated.

Function value at lo.

fHi

private double fHi

Deprecated.

Function value at hi.

fMid

private double fMid

Deprecated.

Function value at mid.

Constructor Detail

BracketFinder

public BracketFinder()

Deprecated.

Constructor with default values 100, 50 (see the other constructor).

BracketFinder

public BracketFinder(double growLimit,
             int maxEvaluations)

Deprecated.

Create a bracketing interval finder.

Parameters:

growLimit - Expanding factor.

maxEvaluations - Maximum number of evaluations allowed for finding a bracketing interval.

Method Detail

search

public void search(UnivariateFunction func,
          GoalType goal,
          double xA,
          double xB)

Deprecated.

Search new points that bracket a local optimum of the function.

Parameters:

func - Function whose optimum should be bracketed.

goal - Goal type.

xA - Initial point.

xB - Initial point.

Throws:

TooManyEvaluationsException - if the maximum number of evaluations is exceeded.

getMaxEvaluations

public int getMaxEvaluations()

Deprecated.

Returns:

the number of evalutations.

getEvaluations

public int getEvaluations()

Deprecated.

Returns:

the number of evalutations.

getLo

public double getLo()

Deprecated.

Returns:

the lower bound of the bracket.

See Also:

getFLo()

getFLo

public double getFLo()

Deprecated.

Get function value at getLo().

Returns:

function value at getLo()

getHi

public double getHi()

Deprecated.

Returns:

the higher bound of the bracket.

See Also:

getFHi()

getFHi

public double getFHi()

Deprecated.

Get function value at getHi().

Returns:

function value at getHi()

getMid

public double getMid()

Deprecated.

Returns:

a point in the middle of the bracket.

See Also:

getFMid()

getFMid

public double getFMid()

Deprecated.

Get function value at getMid().

Returns:

function value at getMid()

eval

private double eval(UnivariateFunction f,
          double x)

Deprecated.

Parameters:

f - Function.

x - Argument.

Returns:

f(x)

Throws:

TooManyEvaluationsException - if the maximal number of evaluations is exceeded.