Package dev.nm.analysis.differentiation.univariate

Class DBeta

java.lang.Object
dev.nm.analysis.function.rn2r1.AbstractRealScalarFunction
dev.nm.analysis.function.rn2r1.AbstractBivariateRealFunction
dev.nm.analysis.differentiation.univariate.DBeta
All Implemented Interfaces:
Function<Vector,Double>, BivariateRealFunction, RealScalarFunction
public class DBeta extends AbstractBivariateRealFunction
This is the first order derivative function of the Beta function w.r.t x, \({\partial \over \partial x} \mathrm{B}(x, y)\). \[ {\partial \over \partial x} \mathrm{B}(x, y) = \mathrm{B}(x, y) (\psi(x) - \psi(x + y)) \] where \(x > 0, y > 0\), \(\psi\) is the Digamma function.
See Also:

  • Constructor Details

    • DBeta

      public DBeta()

  • Method Details

    • evaluate

      public double evaluate(double x, double y)
      Evaluate \({\partial \over \partial x} \mathrm{B}(x, y)\).
      Parameters:
      x - x > 0
      y - y > 0
      Returns:
      \({\partial \over \partial x} \mathrm{B}(x, y)\)