In PostgreSQL, tanh()
is a hyperbolic function that returns the hyperbolic tangent of its argument.
The argument and return value are provided as a double precision value.
Syntax
The syntax goes like this:
tanh(x)
Where x
is a double precision value.
Example
Here’s an example to demonstrate.
SELECT tanh(.5);
Result:
0.46211715726000974
About Hyperbolic Functions
Hyperbolic functions come from measurements made on a hyberbola.
Whereas the trigonometric functions relate to a circle, the hyperbolic functions relate to a hyperbola.
In mathematics, a hyperbola is basically two curves that are like infinite bows.
The following websites provide more information about hyperbola and hyperbolic functions: