tanh
Description
Computes the hyperbolic tangent of the argument.
This function is supported from v3.0.
Syntax
DOUBLE tanh(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 hyperbolic 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 tanh(-1);
+---------------------+
| tanh(-1) |
+---------------------+
| -0.7615941559557649 |
+---------------------+
mysql> select tanh(0);
+---------+
| tanh(0) |
+---------+
| 0 |
+---------+
mysql> select tanh(1);
+--------------------+
| tanh(1) |
+--------------------+
| 0.7615941559557649 |
+--------------------+
mysql> select tanh("");
+----------+
| tanh('') |
+----------+
| NULL |
+----------+
keyword
TANH