atan

returns the arc tangent of a number in radians.

# Metadata

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

# Syntax

the atan of number

# Params

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

# Examples

atan(0) atan(tan(-1))

the atan of vectorMagnitude

# Description

Use the atan function to find the arc tangent of a number.

The arc tangent of number is an angle whose tangent is equal to number. In other words, atan is an inverse of the tan function.

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

- **keyword:** inverse - **constant:** pi - **function:** tan - **control structure:** function - **glossary:** radian, custom function, return, degree, math operation