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Ln()

Category: Number

Syntax: Ln ( number )

Parameters: number ”any positive number or expression that returns a positive 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.

Examples:

Ln (2.7182818)

Returns .9999999895305023 .

Ln (Exp(1))

Returns 1 .

Ln (100)

Returns 4.6051701859880914 .

Ln (Exp(5))

Returns 5 .

Comments:

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. The log, base- x , of y , is equivalent to the Ln (y) / Ln (x) .