jasext.hist.function

Class ExponentialFunction

java.lang.Object

java.util.Observable

jas2.hist.Basic1DFunction

jas2.hist.Fittable1DFunction

jasext.hist.function.ExponentialFunction

All Implemented Interfaces:

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

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

Field Summary

Fields inherited from interface jas2.hist.DataSource

DATE, DELTATIME, DOUBLE, INTEGER, STRING

Constructor Summary

Constructors

Constructor and Description
ExponentialFunction(double xmin, double xmax, double ymin, double ymax)

Method Summary

Modifier and Type	Method and Description
Handle[]	getHandles(double xLow, double xHigh, double yLow, double yHigh)
java.lang.String[]	getParameterNames()
double[]	getParameterValues()
java.lang.String	getTitle() Return the caption to be used in the legend for this data.
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 jas2.hist.Fittable1DFunction

clearFit, clearFitParams, getDerivatives, getExtendedStatistic, getFit, getIncludeParametersInFit, getStatistic, getStatisticNames, setIncludeParameterInFit

Methods inherited from class jas2.hist.Basic1DFunction

getStatistics, setBatch, setChanged, setChanged

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

ExponentialFunction

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

Method Detail

valueAt

public double valueAt(double x)

Specified by:

valueAt in interface FunctionData

valueAt

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

Specified by:

valueAt in class Fittable1DFunction

getParameterNames

public java.lang.String[] getParameterNames()

Specified by:

getParameterNames in interface FunctionData

getParameterValues

public double[] getParameterValues()

Specified by:

getParameterValues in interface FunctionData

setParameter

public void setParameter(int index,
                         double value)

Specified by:

setParameter in interface FunctionData

setFit

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

Specified by:

setFit in class Fittable1DFunction

getTitle

public java.lang.String getTitle()

Description copied from interface: DataSource

Return the caption to be used in the legend for this data.

Specified by:

getTitle in interface DataSource

getHandles

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

Specified by:

getHandles in interface HasHandles