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atan

Description​

Computes the arc tangent of the argument.

Syntax​

DOUBLE atan(DOUBLE arg)

Parameters​

arg: You can specify only a numeric value. This function converts the numeric value into a DOUBLE value before it computes the arc tangent of the value.

Return value​

Returns a value of the DOUBLE data type.

Usage notes​

If you specify a non-numeric value, this function returns NULL.

Examples​

mysql> select atan(1);
+--------------------+
| atan(1)            |
+--------------------+
| 0.7853981633974483 |
+--------------------+

mysql> select atan(0);
+---------+
| atan(0) |
+---------+
|       0 |
+---------+

mysql> select atan(-1);
+---------------------+
| atan(-1)            |
+---------------------+
| -0.7853981633974483 |
+---------------------+

mysql> select atan("");
+----------+
| atan('') |
+----------+
|     NULL |
+----------+

keyword​

ATAN