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Gamma Ln Function
Math Engineering Class

Public Function GammaLn( _
    ByVal vX As Variant _
    ) As Variant

Compute the logarithm of the absolute value of the Gamma function.

Examples: 
    GammaLn(0.1) = 2.25271265173421
    GammaLn(2.5) = 0.284682870472919
    GammaLn(4.0) = 1.79175946922805
    GammaLn(200) = 857.933669825857
    GammaLn(1000) = 5905.22042320918
    GammaLn(100) = Log(Gamma(100))
See also: 
    Gamma Function
    GammaILn Function
    DLNGAM Function
vX: Function returns Null if vX is Null or cannot be fixed up to a Double precision floating point number.

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