WorksheetFunction.GammaLn(Double) Method
Definition
Important
Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.
Returns the natural logarithm of the gamma function, Γ(x).
public:
double GammaLn(double Arg1);public double GammaLn (double Arg1);Public Function GammaLn (Arg1 As Double) As DoubleParameters
- Arg1
- Double
X - the value for which you want to calculate GAMMALN.
Returns
Remarks
Important: This function has been replaced with one or more new functions that may provide improved accuracy and whose names better reflect their usage. This function is still available for compatibility with earlier versions of Excel. However, if backward compatibility is not required, you should consider using the new functions from now on, because they more accurately describe their functionality. For more information about the new function, see the GammaLn_Precise(Double) method.
If x is nonnumeric, GammaLn returns the #VALUE! error value.
If x ≤ 0, GammaLn returns the #NUM! error value.
The number e raised to the GAMMALN(i) power, where i is an integer, returns the same result as (i - 1)!.
GammaLn is calculated as follows:
Figure 1: Equation for the GammaLn method
Where:
Figure 2: Equation