Returns a Double specifying the natural logarithm of a number.

Syntax

Log(number)

The required number argument is a Double or any valid numeric expression greater than zero.

Remarks

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)

The following example illustrates a custom Function that calculates base-10 logarithms: 

Static Function Log10(X) Log10 = Log(X) / Log(10#) End Function

Example

This example uses the Log function to return the natural logarithm of a number. 

Dim MyAngle, MyLog ' Define angle in radians. MyAngle = 1.3 ' Calculate inverse hyperbolic sine. MyLog = Log(MyAngle + Sqr(MyAngle * MyAngle + 1))