atan2

returns the arc tangent of one number divided by another, using the sign of both.

# Metadata

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

# Syntax

atan2(yCoordinate, xCoordinate)

# Params

- yCoordinate : A number or an expression that evaluates to a number. - xCoordinate : A number or an expression that evaluates to a number.

# Examples

atan2(-1,-1) -- returns 4/3 * pi

atan2(thisNumber,thatNumber)

# Description

Use the atan2 function to find the arc tangent of one number divided by another when sign is significant.

In most cases, atan2(y,x) is equal to atan(y/x). However, if both x and y are negative, the sign of x/y is positive. In this case, the atan function returns an angle in the first quadrant, but the atan2 function returns an angle in the third quadrant.

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

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