jasext.hist.fitter

Class LeastSquaresFit

java.lang.Object

java.util.Observable

jas2.hist.Fitter

jasext.hist.fitter.LeastSquaresFit

All Implemented Interfaces:

java.io.Serializable, java.lang.Runnable, java.util.Observer

public class LeastSquaresFit
extends Fitter

See Also:

Serialized Form

Field Summary

Fields inherited from class jas2.hist.Fitter

FAILED, FIT, FITTING, NOTREADYTOFIT, OUTAHERE, READYTOFIT

Constructor Summary

Constructors

Constructor and Description
LeastSquaresFit()

Method Summary

Modifier and Type	Method and Description
void	fit(Fittable1DFunction func, double[] x, double[] y, double[] sigmaY) This algorithm based on CURFIT program from "Data Reduction and Error Analysis for the Physical Sciences" by Philip R Bevington, Page 237.
double	getChiSquared()
double[]	getParameterSigmas()

Methods inherited from class jas2.hist.Fitter

fit, getData, getFunction, getState, run, setData, setFunction, start, stop, update

Methods inherited from class java.util.Observable

addObserver, countObservers, deleteObserver, deleteObservers, hasChanged, notifyObservers, notifyObservers

Methods inherited from class java.lang.Object

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

Constructor Detail

LeastSquaresFit

public LeastSquaresFit()

Method Detail

fit

public void fit(Fittable1DFunction func,
                double[] x,
                double[] y,
                double[] sigmaY)
         throws FitFailed

This algorithm based on CURFIT program from "Data Reduction and Error Analysis for the Physical Sciences" by Philip R Bevington, Page 237. It performs a least squared fit using the Marquardt algorithm.

Parameters:

func - The function to be fit

x - The x values of the points to be fit

y - The y values of the points to be fit

sigmaY - The errors (assumed symmetric) on the y values

Throws:

FitFailed - if the fit was not successful

getChiSquared

public double getChiSquared()

Specified by:

getChiSquared in class Fitter

getParameterSigmas

public double[] getParameterSigmas()

Specified by:

getParameterSigmas in class Fitter