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Home MathPack Statis Functions LnGamma  
See also: LnBeta, BinomCoeff, IncompleteGamma  
LnGamma 

The function LnGamma returns the natural logarithm of the Gamma function. The parameter x may assume any values greater than zero, for all other values the function returns a zero value. The Gamma function is defined as follows:
Note: The Gamma function is calculated according to a formula given by Lanczos, which gives better numerical precision than by using a series expansion. Precision is about 8 decimal places (for arguments x > 1).
