org.apache.commons.math.analysis.function
Class Gaussian

java.lang.Object
  org.apache.commons.math.analysis.function.Gaussian

All Implemented Interfaces:

DifferentiableUnivariateRealFunction, UnivariateRealFunction

public class Gaussian
extends java.lang.Object
implements DifferentiableUnivariateRealFunction

Gaussian function.

Since:

3.0

Version:

$Id$

Nested Class Summary

static class

Gaussian.Parametric Parametric function where the input array contains the parameters of the Gaussian, ordered as follows: Norm Mean Standard deviation

Constructor Summary

Gaussian()
Normalized gaussian with zero mean and unit standard deviation.

Gaussian(double mean, double sigma)
Normalized gaussian with given mean and standard deviation.

Gaussian(double norm, double mean, double sigma)
Gaussian with given normalization factor, mean and standard deviation.

Method Summary

UnivariateRealFunction	derivative() Returns the derivative of the function
double	value(double x) Compute the value of the function.

Methods inherited from class java.lang.Object

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

Constructor Detail

Gaussian

public Gaussian(double norm,
                double mean,
                double sigma)

Gaussian with given normalization factor, mean and standard deviation.

Parameters:

norm - Normalization factor.

mean - Mean.

sigma - Standard deviation.

Throws:

NotStrictlyPositiveException - if sigma <= 0.

Gaussian

public Gaussian(double mean,
                double sigma)

Normalized gaussian with given mean and standard deviation.

Parameters:

mean - Mean.

sigma - Standard deviation.

Throws:

NotStrictlyPositiveException - if sigma <= 0.

Gaussian

public Gaussian()

Normalized gaussian with zero mean and unit standard deviation.

Method Detail

value

public double value(double x)

Compute the value of the function.

Specified by:

value in interface UnivariateRealFunction

Parameters:

x - Point at which the function value should be computed.

Returns:

the value of the function.

derivative

public UnivariateRealFunction derivative()

Returns the derivative of the function

Specified by:

derivative in interface DifferentiableUnivariateRealFunction

Returns:

the derivative function