Formula Engine Reference Guide
 

 

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ATAN2(X, Y)

Description
This function returns the 4-quadrant arc tangent of Y/X. At least one of the arguments must be non-zero. The result is the angle (in radians) and ranges between -PI and +PI. To convert the result from radians to degrees, use the DEGREES function.
 
Parameters
X
A numeric value
 
Y
A numeric value
 
Examples
ATAN2(1, 1) = 0.78539816
 
ATAN2(A1, A2) = -0.78539816
where A1 = 10 and A2 = -10
 
ATAN2(D3, S5) = 1.5707963
where D3 = 0 and S5 = 1
 
ATAN2(0, 0) = Error - ATAN2, one argument must be non-zero
 
DEGREES(ATAN2(1, 3)) = 71.565