com.numericalmethod.suanshu.analysis.differentiation.univariate
Class DBeta

java.lang.Object
  com.numericalmethod.suanshu.analysis.function.rn2r1.BivariateRealFunction
      com.numericalmethod.suanshu.analysis.differentiation.univariate.DBeta

All Implemented Interfaces:

Function, RealScalarFunction

public class DBeta
extends BivariateRealFunction

This class represents the first order derivative function of the Beta function w.r.t x, i.e., dB(x, y)/dx.

dB(x, y)/dx = B(x, y) * (ψ(x) - ψ(x + y)),

where x > 0, y > 0

See Also:

Beta, Wikipedia: Derivatives

Nested Class Summary

Nested classes/interfaces inherited from interface com.numericalmethod.suanshu.analysis.function.Function

Function.EvaluationException

Constructor Summary

DBeta()

Method Summary

double

evaluate(double x, double y) Evaluate dB(x, y)/dx.

Methods inherited from class com.numericalmethod.suanshu.analysis.function.rn2r1.BivariateRealFunction

dimension4Domain, dimension4Range, evaluate

Methods inherited from class java.lang.Object

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

Constructor Detail

DBeta

public DBeta()

Method Detail

evaluate

public double evaluate(double x,
                       double y)

Evaluate dB(x, y)/dx.

Specified by:

evaluate in class BivariateRealFunction

Parameters:

x - x > 0

y - y > 0

Returns:

dB(x, y)/dx