Intel® Fortran Compiler Classic and Intel® Fortran Compiler Developer Guide and Reference

ID 767251
Date 11/07/2023
Public

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ATANH

Elemental Intrinsic Function (Generic): Produces the hyperbolic arctangent of x.

result = ATANH (x)

x

(Input) Must be of type real, where | x | is less than or equal to 1, or of type complex.

Results

The result type and kind are the same as x.

If the result is real, it lies in the range -1.0 < ATANH (x) < 1.0.

If the result is complex, the imaginary part is expressed in radians and lies in the range –pi/2 <= AIMAG (ATANH (x)) <= pi/2.

Specific Name

Argument Type

Result Type

ATANH

REAL(4)

REAL(4)

DATANH

REAL(8)

REAL(8)

QATANH

REAL(16)

REAL(16)

Example

ATANH (-0.77) has the value -1.02033.

ATANH (0.5) has the value 0.549306.