catanh(), catanhf(), catanhl() — Calculate the complex arc hyperbolic tangent

Standards

Standards / Extensions	C or C++	Dependencies
C99 Single UNIX Specification, Version 3	both	z/OS V1R7 a compiler that is designed to support C99

Format

#include <complex.h>

double complex catanh(double complex z);
float complex catanhf(float complex z);
long double complex catanhl(long double complex z);

General description

The catanh() family of functions compute the complex arc hyperbolic tangent of z, with branch cuts outside the interval [-1, +1] along the real axis.

Note: The following table shows the viable formats for these functions. See IEEE binary floating-point for more information about IEEE Binary Floating-Point.

Function	Hex	IEEE
catanh	X	X
catanhf	X	X
catanhl	X	X

Returned value

The catanh() family of functions return the complex arc hyperbolic tangent value, in the range of a strip, mathematically unbounded along the real axis and in the interval [-i π/2, +i π/2] along the imaginary axis.

Example

For an example of a similar function see cacos(), cexp() or cpow().