**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.