#
Fortran Wiki

atanh

## Description

`atanh(x)`

computes the inverse hyperbolic tangent of `x`

.

## Standard

Fortran 2008 and later

## Class

Elemental function

## Syntax

`result = atanh(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 and lies between $-\pi/2 \leq \mathop{Im}{\atanh(x)} \leq \pi/2$.

## Example

```
program test_atanh
real, dimension(3) :: x = (/ -1.0, 0.0, 1.0 /)
write (*,*) atanh(x)
end program
```

## See also

Inverse function: tanh

Revised on April 3, 2016 09:25:20
by

Jason Blevins
(173.88.47.127)
(715 characters / 0.0 pages)