atan2()

Calculates the angle, in radians, between the positive x-axis and the ray from the origin to the point (y, x).

Syntax

atan2(y,x)

Learn more about syntax conventions.

Parameters

Name	Type	Required	Description
y	real	✔️	The Y coordinate.
x	real	✔️	The X coordinate.

Returns

Returns the angle in radians between the positive x-axis and the ray from the origin to the point (y, x).

Examples

The following example returns the angle measurements in radians.

Run the query

print atan2_0 = atan2(1,1) // Pi / 4 radians (45 degrees)
| extend atan2_1 = atan2(0,-1) // Pi radians (180 degrees)
| extend atan2_2 = atan2(-1,0) // - Pi / 2 radians (-90 degrees)

Output

atan2_0	atan2_1	atan2_2
0.785398163397448	3.14159265358979	-1.5707963267949