/GNU Fortran 7

# 9.265 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