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### 9.23 ATANH — Inverse hyperbolic tangent function

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 \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


Specific names:

 Name Argument Return type Standard DATANH(X) REAL(8) X REAL(8) GNU extension