LN

From LongJump Support Wiki

The LN function calculates the natural logarithm of a number. LN is the inverse of EXP. Natural logarithms are based on the constant e, whose value truncated to 10 decimal points is 2.7182818285.

Syntax
LN(number)
Return
Number
Examples
LN(2.7183) = 1
LN(12) = 4.4246