ln

returns the natural logarithm of a number.

# Metadata

Platforms: desktop, server, mobile OS: mac, windows, linux, ios, android Introduced: 1.0 Security:

# Syntax

the ln of number

# Params

- number : A positive number, or an expression that evaluates to a positive number.

# Examples

ln(1) -- returns zero

ln(0.15) -- returns -1.89712

ln(10) -- returns 2.302585

# Description

Use the ln function to obtain a base e logarithm.

The natural logarithm of a number is the power to which e must be raised to obtain the number.

The transcendental number e appears in many mathematical formulas.

To find the logarithm of a number in any base, use the following function:

function logarithm theBase,theNumber return ln(theNumber)/ln(theBase) end logarithm

If a math operation on finite inputs produces a non-finite output, an execution error is thrown. See math operations for more information.

# Tags

math,

# See

- **control structure:** function - **glossary:** return, math operation - **function:** ln1, exp