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:
![](images/special-functions-0133fa.jpg)
IncompleteGamma() returns the value of the lower regularized incomplete gamma function.