jasext.hist.fitter
Class LeastSquaresFit

java.lang.Object
  |
  +--java.util.Observable
        |
        +--jas.hist.Fitter
              |
              +--jasext.hist.fitter.LeastSquaresFit

All Implemented Interfaces:

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

public class LeastSquaresFit

extends Fitter

See Also:

Serialized Form

Fields inherited from class jas.hist.Fitter

FAILED, FIT, FITTING, NOTREADYTOFIT, OUTAHERE, READYTOFIT

Constructor Summary

LeastSquaresFit()

Method Summary

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 jas.hist.Fitter

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

Methods inherited from class java.util.Observable

addObserver, clearChanged, countObservers, deleteObserver, deleteObservers, hasChanged, notifyObservers, notifyObservers, setChanged

Methods inherited from class java.lang.Object

clone, equals, finalize, 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.

Overrides:

fit in class Fitter

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()

Overrides:

getChiSquared in class Fitter

getParameterSigmas

public double[] getParameterSigmas()

Overrides:

getParameterSigmas in class Fitter