Open System Services Library Calls Reference Manual (G06.29+, H06.08+, J06.03+)

OSS Library Calls (a - d) catanh(3)

NAME

catanh - Computes the complex arc hyperbolic tangent

LIBRARY

H-series and J-series native Guardian processes: $SYSTEM.ZDLLnnn.ZCREDLL

32-bit H-series and J-series OSS processes: /G/system/zdllnnn/zcredll

64-bit H-series and J-series OSS processes: /G/system/zdllnnn/ycredll

SYNOPSIS

#include <complex.h>

double complex catanh(

double complex z);

PARAMETERS

z Speciﬁes a double complex value.

DESCRIPTION

The catanh( ) function computes the complex arc hyperbolic tangent of z, with branch cuts out-

side the interval [-1, +1] along the real axis.

NOTES

This function is implemented only for the IEEE_ﬂoat ﬂoating-point option. Applications using

this function cannot be compiled if the speciﬁed ﬂoating-point option is Tandem_ﬂoat.

RETURN VALUES

The catanh( ) function returns the complex arc hyperbolic tangent of z in the range of a strip

mathematically unbound along the real axis and in the interval [-iπ/2, +iπ/2] along the imaginary

axis.

ERRORS

No errors are deﬁned.

RELATED INFORMATION

Functions: atanh(3), catanhf(3), catanhl(3), ctanh(3).

STANDARDS CONFORMANCE

This function conforms to the ISO/IEC 9899:1999 standard.

This function conforms to the IEEE Std 1003.1, 2004 Edition.

527187-017 Hewlett-Packard Company 1−83