atan2

(PHP 3 >= 3.0.5, PHP 4, PHP 5)

atan2 -- Arc tangent of two variables

Description

float atan2 ( float y, float x )

This function calculates the arc tangent of the two variables x and y. It is similar to calculating the arc tangent of y / x, except that the signs of both arguments are used to determine the quadrant of the result.

The function returns the result in radians, which is between -PI and PI (inclusive).

Parameters

x

Dividend parameter

y

Divisor parameter

Return Values

The arc tangent of x/y in radians.

See Also

atan()