log2

returns the base-2 logarithm of a number.

# Metadata

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

# Syntax

the log2 of number

# Params

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

# Examples

log2(8) -- returns 3

log2(0.125) -- returns -3

# Description

Use the log2 function to obtain a base-2 logarithm.

The base-2 logarithm of a number is the power to which 2 must be raised to obtain the number : 2^log2(number) is equal to number.

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