W3cubDocs

/GNU Fortran 7

9.27 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
See also:

Inverse function: TANH

© Free Software Foundation
Licensed under the GNU Free Documentation License, Version 1.3.
https://gcc.gnu.org/onlinedocs/gcc-7.1.0/gfortran/ATANH.html