Lahey/GNU Fortran

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8.23 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

See also:
Inverse function: TANH