Returns the natural logarithm of a number (Double).

numberThe number (Double).

* The "number" can be any numeric expression greater than zero.
* The natural logarithm is the logarithm to the base e. The constant e is approximately 2.718282.
* You can calculate base-n logarithms for any number x by dividing the natural logarithm of x by the natural logarithm of n as follows: Logn(x) = Log(x) / Log(n)
* You can use the EXP function to return the base of natural logarithm raised to a power.
* The equivalent Excel function is Application.WorksheetFunction.LN.
* The equivalent .NET function is System.Math.Log
* For the Microsoft documentation refer to docs.microsoft.com

Log(86) = 4.454 
Log(2.7182818) = 1
Exp(Log(4)) = 4

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