atan2

description

Syntax

DOUBLE atan2(DOUBLE y, DOUBLE x) 返回 ‘y’ / ‘x’ 的反正切.

example

1. mysql> select atan2(0.1, 0.2);
2. +---------------------+
3. | atan2(0.1, 0.2)     |
4. +---------------------+
5. | 0.46364760900080609 |
6. +---------------------+

8. mysql> select atan2(1.0, 1.0);
9. +---------------------+
10. | atan2(1.0, 1.0)     |
11. +---------------------+
12. | 0.78539816339744828 |
13. +---------------------+

keywords

1. ATAN2