Returns the natural logarithm of the gamma function.

xThe number you want the natural logarithm of.

* GAMMALN.PRECISE was added in Excel 2010 to replace this function.
* If "x" is not numeric, then #VALUE! is returned.
* If "x" = 0, then #NUM! is returned.
* The number e raised to the GAMMALN(i) power, where i is an integer, returns the same result as (i - 1)!.
* You can use the GAMMA function
* For the Microsoft documentation refer to
* For the Google documentation refer to

1=GAMMALN(4) = 1.792
2=GAMMALN(2.5) = 0
3=EXP(GAMMALN(4)) = 6
4=GAMMALN(-1) = #NUM!
5=GAMMALN("some text") = #VALUE!

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