The Open Group Base Specifications Issue 6

IEEE Std 1003.1, 2004 Edition

Copyright © 2001-2004 The IEEE and The Open Group, All Rights reserved.A newer edition of this document exists here

#### NAME

catanh, catanhf, catanhl - complex arc hyperbolic tangent functions

#### SYNOPSIS

`#include <complex.h>`

double complex catanh(double complex *z*`);`

float complex catanhf(float complex *z*`);`

long double complex catanhl(long double complex *z*`);`

#### DESCRIPTION

^{[CX]} The functionality described on this reference page is aligned with the ISO C standard. Any conflict between the
requirements described here and the ISO C standard is unintentional. This volume of IEEE Std 1003.1-2001 defers to
the ISO C standard.

These functions shall compute the complex arc hyperbolic tangent of *z*, with branch cuts outside the interval
[-1, +1] along the real axis.

#### RETURN VALUE

These functions shall return the complex arc hyperbolic tangent value, in the range of a strip mathematically unbounded along
the real axis and in the interval [-*i*/2, +*i*/2] along the imaginary axis.

#### ERRORS

No errors are defined.

*The following sections are informative.*

#### EXAMPLES

None.

#### APPLICATION USAGE

None.

#### RATIONALE

None.

#### FUTURE DIRECTIONS

None.

#### SEE ALSO

*ctanh*(), the Base Definitions volume of IEEE Std 1003.1-2001, *<complex.h>*

#### CHANGE HISTORY

First released in Issue 6. Derived from the ISO/IEC 9899:1999 standard.

*End of informative text.*

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