Calculates the arc tangent using the tangent y/x of an angle.

Syntax

@ATan2( x ; y )

Parameters

x

Number or number list. The denominator of the tangent value y / x.

Number or number list. The numerator of the tangent value y / x.

If either parameter is a list, the function operates pair-wise on the list elements, and the return value is a list with the number of elements in the larger list.

Return value

angle

Number. An angle, in radians, from -pi through pi. This represents an angle between -180 and 180 degrees, depending on the sign of x and y (see the list below).

	If	Then angle is in the range
	x is positive y is positive	0 to pi/2 (Quadrant I)
	x is negative y is positive	pi/2 to pi (Quadrant II)
	x is negative y is negative	-pi to -pi/2 (Quadrant III)
	x is positive y is negative	-pi/2 to 0 (Quadrant IV)

ATn2 function in LotusScript language

Example
See Also

@ATan
@Tan
@Pi
Performing arithmetic operations

Glossary