atan¶
This function is used to return the arc tangent value of a given angle a.
Syntax¶
atan(DOUBLE a)
Parameters¶
Parameter | Mandatory | Type | Description |
|---|---|---|---|
a | Yes | DOUBLE, BIGINT, DECIMAL, or STRING | The value can be a float, integer, or string. If the value is not of the DOUBLE type, the system will implicitly convert it to the DOUBLE type for calculation. |
Return Values¶
The return value is of the DOUBLE type. The value ranges from -Pi/2 to Pi/2.
Note
If the value of a is not within the range [-1,1], NaN is returned.
If the value of a is NULL, NULL is returned.
Example Code¶
The value 0.7853981633974483 is returned.
select atan(1);
The value 0.5404195002705842 is returned.
select atan(0.6);
The value NULL is returned.
select atan(null);