9.256. TANH

9.256 TANH — Hyperbolic tangent function

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

Specific names:

Name	Argument	Return type	Standard
TANH(X)	REAL(4) X	REAL(4)	Fortran 95 and later
DTANH(X)	REAL(8) X	REAL(8)	Fortran 95 and later

See also:

ATANH