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