jasext.hist.function
Class ExponentialFunction

java.lang.Object
  |
  +--java.util.Observable
        |
        +--jas.hist.Basic1DFunction
              |
              +--jas.hist.Fittable1DFunction
                    |
                    +--jasext.hist.function.ExponentialFunction

All Implemented Interfaces:

DataSource, ExtendedStatistics, FunctionData, HasHandles, HasStatistics, java.io.Serializable, Statistics

public class ExponentialFunction

extends Fittable1DFunction

implements HasHandles

Fittable Exponential function with handles: y(x) = A exp(-(x-x0)/E) A = amplitude, corresponding to function value for x=x0 x0 = origin, corresponding to y(xo) = A E = reciprocal exponent (decay constant) The initial function will be a negative exponential based on the current maximum and minimum axis values (not the data). A positive exponential can be formed by dragging the handles. Handles: There are two handles. Handle 1: Changes the function amplitude and origin. The handle position corresponds to the current amplitude and origin values. Handle 2: Changes the reciprocal exponent value. The handle y position is 1/e * amplitude (=0.367*A); the x position is offset from the function origin by the reciprocal of the exponent.

See Also:

Serialized Form

Fields inherited from interface jas.hist.DataSource

DATE, DELTATIME, DOUBLE, INTEGER, STRING

Constructor Summary

ExponentialFunction(double xmin, double xmax, double ymin, double ymax)

Method Summary

Handle[]	getHandles(double xLow, double xHigh, double yLow, double yHigh)
java.lang.String[]	getParameterNames()
double[]	getParameterValues()
java.lang.String	getTitle()
void	setFit(Fitter fit, double[] value)
void	setParameter(int index, double value)
double	valueAt(double x)
double	valueAt(double x, double[] a)

Methods inherited from class jas.hist.Fittable1DFunction

clearFit, clearFitParams, destroy, getDerivatives, getExtendedStatistic, getFit, getIncludeParametersInFit, getStatistic, getStatisticNames, initIncludeParametersInFit, setFit, setIncludeParameterInFit

Methods inherited from class jas.hist.Basic1DFunction

getStatistics, setBatch, setChanged, setChanged

Methods inherited from class java.util.Observable

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

Methods inherited from class java.lang.Object

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

Constructor Detail

ExponentialFunction

public ExponentialFunction(double xmin,
                           double xmax,
                           double ymin,
                           double ymax)

Method Detail

valueAt

public double valueAt(double x)

Overrides:

valueAt in class Basic1DFunction

valueAt

public double valueAt(double x,
                      double[] a)

Overrides:

valueAt in class Fittable1DFunction

getParameterNames

public java.lang.String[] getParameterNames()

Overrides:

getParameterNames in class Basic1DFunction

getParameterValues

public double[] getParameterValues()

Overrides:

getParameterValues in class Basic1DFunction

setParameter

public void setParameter(int index,
                         double value)

Overrides:

setParameter in class Basic1DFunction

setFit

public void setFit(Fitter fit,
                   double[] value)

Overrides:

setFit in class Fittable1DFunction

getTitle

public java.lang.String getTitle()

Overrides:

getTitle in class Basic1DFunction

getHandles

public Handle[] getHandles(double xLow,
                           double xHigh,
                           double yLow,
                           double yHigh)

Specified by:

getHandles in interface HasHandles