Ln()

Category: Number

Syntax: Ln ( number )

Parameters:

numberAny positive number or expression that returns a positive number.

Data type returned: Number

Description:

Returns the natural logarithm of the specified number. The natural logarithm uses the transcendental number e as its base. The value of e is approximately 2.71828.

Exp() and Ln() are inverse functions of one another.

The Log() and Lg() functions produce base-10 and base-2 logarithms, respectively. The Ln() function produces base-e logarithms, but it can also be used to solve a logarithm of any base. Log (base-x) of y is equivalent to Ln (y) / Ln (x).

Examples:

Function	Results
Ln (2.7182818)	Returns .9999999895305023.
Ln (Exp(1))	Returns 1.
Ln (100)	Returns 4.6051701859880914.
Ln (Exp(5))	Returns 5.