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

All Methods Instance Methods Concrete Methods
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 + a1exp(a2x).
`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

Class FitExponential

Field Summary

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

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

Constructor Summary

Method Summary

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

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

Methods inherited from class java.lang.Object

Constructor Detail

FitExponential

FitExponential

FitExponential

Method Detail

driver

displayResults

fitToFunction

testData

calculateFittedY

generateResiduals

calculateChiSq