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Probabilities.digamma Method
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Returns digamma function or psi(0,x)

Syntax
C#
Visual Basic
public static double digamma(double x);
Remarks

Computes the first derivate of the logarithm of the gamma function. The function returns NAN, if the x is less than zero. 

The algorithm was adapted from: 

The algorithm "AS 103" from "Applied Statistics" (1976) VOL.25, NO.3 Available in Fortran at: http://lib.stat.cmu.edu/apstat/103

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