tanh

Description

Computes the hyperbolic tangent of the argument.

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

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