org.orangepalantir.leastsquares.fitters

Class MarquardtFitter

java.lang.Object

org.orangepalantir.leastsquares.fitters.MarquardtFitter

All Implemented Interfaces:

Fitter

public class MarquardtFitter
extends Object
implements Fitter

Field Summary

Fields

Modifier and Type	Field and Description
int	ITERATIONS

Constructor Summary

Constructors

Constructor and Description
MarquardtFitter(Function funct)

Method Summary

Modifier and Type	Method and Description
double	calculateDerivative(int k, double[] params, double[] x) Given a set of parameters, and inputs, calculates the derivative of the k'th parameter d/d a_k (F)
void	calculateDerivatives() Creates an array of derivatives since each one is used 3x's
double	calculateErrors() returns the cumulative error for current values
double	calculateSecondDerivative(int l, int k, double[] params, double[] x) NOT USED.
void	createAlphaPrimeMatrix()
void	createBetaMatrix()
void	fitData() Main routine, call this and the Parameters are iterated until it is finished.
double[]	getParameters() Gets the current set of parameters values.
double[]	getUncertainty()
void	initializeWorkspace()
void	iterateValues() Takes the current error, and the current parameter set and calculates the changes, then returns the maximum changed value
String	printMatrix() for stack traces
void	setData(double[][] xvalues, double[] zvalues) Sets the values of of the original data points that are going to be fit.
void	setParameters(double[] parameters)
void	updateLambda(double value)

Methods inherited from class java.lang.Object

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

Field Detail

ITERATIONS

public int ITERATIONS

Constructor Detail

MarquardtFitter

public MarquardtFitter(Function funct)

Method Detail

setData

public void setData(double[][] xvalues,
                    double[] zvalues)

Sets the values of of the original data points that are going to be fit.

Specified by:

setData in interface Fitter

setParameters

public void setParameters(double[] parameters)

Specified by:

setParameters in interface Fitter

calculateErrors

public double calculateErrors()

returns the cumulative error for current values

Specified by:

calculateErrors in interface Fitter

calculateDerivative

public double calculateDerivative(int k,
                                  double[] params,
                                  double[] x)

Given a set of parameters, and inputs, calculates the derivative of the k'th parameter d/d a_k (F)

Parameters:

k - - index of the parameter that the derivative is being taken of

params - - array that will be used to calculate derivatives, note params will be modified.

x - - set of values to use.

Returns:

derivative of function

calculateDerivatives

public void calculateDerivatives()

Creates an array of derivatives since each one is used 3x's

calculateSecondDerivative

public double calculateSecondDerivative(int l,
                                        int k,
                                        double[] params,
                                        double[] x)

NOT USED. Given a set of parameters, and inputs, calculates the second derivatives d^2/d a_l d a_k (F)

Parameters:

k - - index of the parameter that the derivative is being taken of

params - - array that will be used to calculate derivatives, note params will be modified.

x - - set of values to use.

createBetaMatrix

public void createBetaMatrix()

createAlphaPrimeMatrix

public void createAlphaPrimeMatrix()

iterateValues

public void iterateValues()

Takes the current error, and the current parameter set and calculates the changes, then returns the maximum changed value

initializeWorkspace

public void initializeWorkspace()

fitData

public void fitData()

Main routine, call this and the Parameters are iterated until it is finished.

Specified by:

fitData in interface Fitter

updateLambda

public void updateLambda(double value)

getParameters

public double[] getParameters()

Gets the current set of parameters values.

Specified by:

getParameters in interface Fitter

getUncertainty

public double[] getUncertainty()

Specified by:

getUncertainty in interface Fitter

printMatrix

public String printMatrix()

for stack traces