NMath User's Guide

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39.2 Gamma Function (.NET, C#, CSharp, VB, Visual Basic, F#)

The static GammaLn() method on class StatsFunctions evaluates the log of the gamma function at a value x. The gamma function is an extension of the factorial function to complex and real number arguments.

The "complete" gamma function can be generalized to the incomplete gamma function , such that . The "lower" incomplete gamma function is given by:


IncompleteGamma() returns the value of the lower regularized incomplete gamma function.