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 \({\partial \over \partial x} \mathrm{B}(x, y)\).
      x - x > 0
      y - y > 0
      \({\partial \over \partial x} \mathrm{B}(x, y)\)