CATANH(3P)

💖 CATANH(3P) — the POSIX Programmer's Manual, bestie edition 💖

okay so first things first: this page lives in the POSIX Programmer's Manual (yes that's the manual name, we're fancy like that ✨). And a lil heads-up before we even start:

The Linux implementation of this interface may differ (consult the corresponding Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.

Not me warning you about Linux drama in the first paragraph 🙈 anyway—

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🌸 PROLOG 🌸

This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the corresponding Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.

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✨ NAME ✨

catanh, catanhf, catanhl — complex arc hyperbolic tangent functions 🦋

like, the inverse of the hyperbolic tangent, but for complex numbers. she's giving math girlie 💅

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🎀 SYNOPSIS 🎀

#include <complex.h>

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

three flavors, three precisions, all slaying 👑

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💜 DESCRIPTION 💜

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 POSIX.1‐2017 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.

fr fr, those branch cuts are the whole personality of this function. Don't mess with them. 💀

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🫶 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 [-iπ/2, +iπ/2] along the imaginary axis.

so like, real part can go wherever she wants, imaginary part is contained. boundaries, bestie. 🎀

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😭 ERRORS 😭

No errors are defined.

(iconic behavior honestly — she simply does not fail 💅)

The following sections are informative.

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🌈 EXAMPLES 🌈

None.

(yeah, nothing. we're keeping it mysterious 🧚)

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⭐ APPLICATION USAGE ⭐

None.

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🌸 RATIONALE 🌸

None.

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🦋 FUTURE DIRECTIONS 🦋

None.

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👑 SEE ALSO 👑

• ctanh()

The Base Definitions volume of POSIX.1‐2017, <complex.h>

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💖 COPYRIGHT 💖

Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1-2017, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 7, 2018 Edition, Copyright (C) 2018 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html .

Any typographical or formatting errors that appear in this page are most likely to have been introduced during the conversion of the source files to man page format. To report such errors, see https://www.kernel.org/doc/man-pages/reporting_bugs.html .

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and that's the whole page, bestie!! mwah 💋

this lil masterpiece was brought to you by IEEE/The Open Group, dated 2017, filed under CATANH(3P) — go compute some complex arc hyperbolic tangents and have the best day, ily 🫶✨