Package gov.nih.mipav.model.algorithms

Class FitExponential

java.lang.Object

gov.nih.mipav.model.algorithms.NLConstrainedEngine

gov.nih.mipav.model.algorithms.NLFittedFunction

gov.nih.mipav.model.algorithms.FitExponential

public class FitExponential
extends NLFittedFunction

FitExponential -fits an array of points to an exponential of the type y = a0 + a1*exp(a2*x).

Version:

0.9

Author:

William Gandler

See Also:

NLConstrainedEngine

Field Summary

Fields inherited from class gov.nih.mipav.model.algorithms.NLFittedFunction

chisq, EPSILON, MAX_ITR, MIN_ITR, xSeries, yDataFitted, ySeries

Fields inherited from class gov.nih.mipav.model.algorithms.NLConstrainedEngine

a, absoluteConvergence, analyticalJacobian, bl, bounds, bu, ctrlMat, dyda, gues, internalScaling, iters, jacobian, maxIterations, nPts, outputMes, param, parameterConvergence, relativeConvergence, residuals, secondAllowed, stdv, tolerance

Constructor Summary

Constructors

Constructor	Description
FitExponential()	FitExponential - test constructor, builds and test function.
FitExponential(int nPoints, double[] xData, double[] yData)	FitExponential.
FitExponential(int nPoints, float[] xData, float[] yData)	Constructs new fit exponential.

Method Summary

Modifier and Type	Method	Description
protected void	calculateChiSq()	Calculates chi squared
protected void	calculateFittedY()	Calculates yDataFitted
void	displayResults()	Display results of displaying exponential fitting parameters.
void	driver()	Starts the analysis.
void	fitToFunction(double[] a, double[] residuals, double[][] covarMat)	Fit to function - a0 + a1*exp(a2*x).
protected Jama.Matrix	generateResiduals()	Calculates the residuals for a given function, not implemented since some functions might prefer to only use a subset of data points, or not use yDataFitted if working during an iteration
private void	testData()	Test data to test fitting of exponential.

Methods inherited from class gov.nih.mipav.model.algorithms.NLFittedFunction

getChisq, getFittedY, getMedian

Methods inherited from class gov.nih.mipav.model.algorithms.NLConstrainedEngine

dumpTestResults, fitToTestFunction, getChiSquared, getExitStatus, getIterations, getParameters, getResiduals, statusMessage

Methods inherited from class java.lang.Object

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

Constructor Detail

FitExponential

public FitExponential()

FitExponential - test constructor, builds and test function.

FitExponential

public FitExponential(int nPoints,
                      double[] xData,
                      double[] yData)

FitExponential.

Parameters:

nPoints - number of points in the function

xData - DOCUMENT ME!

yData - DOCUMENT ME!

FitExponential

public FitExponential(int nPoints,
                      float[] xData,
                      float[] yData)

Constructs new fit exponential.

Parameters:

nPoints - Number of points in the function

xData - DOCUMENT ME!

yData - DOCUMENT ME!

Method Detail

driver

public void driver()

Starts the analysis. For some reason a guess with the wrong sign for a2 will not converge. Therefore, try both sign and take the one with the lowest chi-squared value.

Overrides:

driver in class NLConstrainedEngine

displayResults

public void displayResults()

Display results of displaying exponential fitting parameters.

Specified by:

displayResults in class NLFittedFunction

fitToFunction

public void fitToFunction(double[] a,
                          double[] residuals,
                          double[][] covarMat)

Fit to function - a0 + a1*exp(a2*x).

Specified by:

fitToFunction in class NLConstrainedEngine

Parameters:

a - The best guess parameter values.

residuals - ymodel - yData.

covarMat - The derivative values of y with respect to fitting parameters.

testData

private void testData()

Test data to test fitting of exponential.

calculateFittedY

protected void calculateFittedY()

Description copied from class: NLFittedFunction

Calculates yDataFitted

Specified by:

calculateFittedY in class NLFittedFunction

generateResiduals

protected Jama.Matrix generateResiduals()

Description copied from class: NLFittedFunction

Calculates the residuals for a given function, not implemented since some functions might prefer to only use a subset of data points, or not use yDataFitted if working during an iteration

Specified by:

generateResiduals in class NLFittedFunction

Returns:

calculateChiSq

protected void calculateChiSq()

Description copied from class: NLFittedFunction

Calculates chi squared

Specified by:

calculateChiSq in class NLFittedFunction