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Gamma R Function
Math Engineering Class

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

Compute the reciprocal of the Gamma function.

Examples: 
    GammaR(0.1) = 0.105113700611178
    GammaR(0.5) = 0.564189583547756
    GammaR(0.9) = 0.935778720912873
    GammaR(1.0) = 1
    GammaR(1.5) = 1.12837916709551
    GammaR(2.0) = 1
    GammaR(2.5) = 0.752252778063675
    GammaR(3.0) = 0.5
    GammaR(4.0) = 0.166666666666667
    GammaR(4.5) = 0.08597174606442
See also: 
    Gamma Function
    DGAMR 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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