Package org.ddogleg.optimization.wrap

Class CachedGradientLineFunction

java.lang.Object

org.ddogleg.optimization.wrap.CachedGradientLineFunction

All Implemented Interfaces:

CoupledDerivative, CoupledGradient, GradientLineFunction, LineSearchFunction

public class CachedGradientLineFunction
extends Object
implements GradientLineFunction

From separate classes for the function and gradient computations implements GradientLineFunction. Results are cached until the next time a line set of parameters or line position is specified.

Field Summary

Fields

Modifier and Type	Field	Description
protected boolean	cachedFunction
protected boolean	cachedGradient
protected double[]	currentGradient
protected double[]	currentInput
protected double	currentOutput
protected double[]	direction
protected FunctionNtoS	function
protected FunctionNtoN	gradient
protected int	N
protected double[]	start

Constructor Summary

Constructors

Constructor	Description
CachedGradientLineFunction(FunctionNtoS function, FunctionNtoN gradient)

Method Summary

Modifier and Type	Method	Description
double	computeDerivative()
double	computeFunction()
void	computeGradient(double[] gradient)
double[]	getCurrentState()
int	getN()
void	setInput(double x)
void	setInput(double[] x)
void	setLine(double[] start, double[] direction)

Methods inherited from class java.lang.Object

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

Field Details

N

protected int N

start

protected double[] start

direction

protected double[] direction

cachedFunction

protected boolean cachedFunction

cachedGradient

protected boolean cachedGradient

currentInput

protected double[] currentInput

currentGradient

protected double[] currentGradient

currentOutput

protected double currentOutput

function

protected FunctionNtoS function

gradient

protected FunctionNtoN gradient

Constructor Details

CachedGradientLineFunction

public CachedGradientLineFunction(FunctionNtoS function,
 FunctionNtoN gradient)

Method Details

setLine

public void setLine(double[] start,
 double[] direction)

Specified by:

setLine in interface LineSearchFunction

getCurrentState

public double[] getCurrentState()

Specified by:

getCurrentState in interface LineSearchFunction

setInput

public void setInput(double x)

Specified by:

setInput in interface CoupledDerivative

getN

public int getN()

Specified by:

getN in interface CoupledGradient

setInput

public void setInput(double[] x)

Specified by:

setInput in interface CoupledGradient

computeFunction

public double computeFunction()

Specified by:

computeFunction in interface CoupledDerivative

Specified by:

computeFunction in interface CoupledGradient

computeGradient

public void computeGradient(double[] gradient)

Specified by:

computeGradient in interface CoupledGradient

computeDerivative

public double computeDerivative()

Specified by:

computeDerivative in interface CoupledDerivative