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