ATAN2

Syntax

ATAN(Y,X), ATAN2(Y,X)

Description

Returns 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.

Examples

SELECT ATAN(-2,2); +---------------------+ | ATAN(-2,2) | +---------------------+ | -0.7853981633974483 | +---------------------+  SELECT ATAN2(PI(),0); +--------------------+ | ATAN2(PI(),0) | +--------------------+ | 1.5707963267948966 | +--------------------+

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