# Fortran Wiki tanh

## Description

tanh(x) computes the hyperbolic tangent of x.

## Standard

FORTRAN 77 and later, for a complex argument Fortran 2008 or later

## Class

Elemental function

## Syntax

x = tanh(x)

## Arguments

• x - The type shall be real or complex.

## Return value

The return value has same type and kind as x. If x is complex, the imaginary part of the result is in radians. If x is real, the return value lies in the range - 1 \\leq tanh(x) \\leq 1.

## Example

program test_tanh
real(8) :: x = 2.1_8
x = tanh(x)
end program test_tanh

atanh

category: intrinsics