atan2

Returns the arc tangent of x divided by y, that is, the arc tangent of x/y. The signs of the two parameters are used to determine the quadrant of the result.

The return value is in the range of [-π, π].

Syntax

Haskell

ATAN2(x,y);

Parameters

x: The supported data type is DOUBLE.

y: The supported data type is DOUBLE.

Return value

Returns a value of the DOUBLE type. Returns NULL if x or y is NULL.

Examples

Plain

mysql> select atan2(-0.8,2);
+---------------------+
| atan2(-0.8, 2)      |
+---------------------+
| -0.3805063771123649 |
+---------------------+
1 row in set (0.01 sec)