Package org.apache.commons.numbers.gamma

Class Trigamma

  • public class Trigamma
extends java.lang.Object
    Trigamma function. It is the derivative of the digamma function: \( \psi_1(x) = \frac{d^2}{dx^2} (\ln \Gamma(x)) \).

    • Constructor Summary

      Constructors 
      Constructor Description
      Trigamma()  

    • Method Summary

      Modifier and Type Method Description
      static double value​(double x)
      Computes the trigamma function.

      • Methods inherited from class java.lang.Object

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

    • Constructor Detail

      • Trigamma

        public Trigamma()

    • Method Detail

      • value

        public static double value​(double x)
        Computes the trigamma function.
        Parameters:
        x - Argument.
        Returns:
        trigamma(x) to within 1e-8 relative or absolute error whichever is larger.