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.
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