catanh
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Name

catanh, catanhf, catanhl — complex arc tangents hyperbolic

Synopsis

#include <complex.h>
double complex catanh( double complex   z);
float complex catanhf( float complex   z);
long double complex catanhl( long double complex   z);
[Note] Note

Link with −lm.

DESCRIPTION

The catanh() function calculates the complex arc hyperbolic tangent of z. If y = catanh(z), then z = ctanh(y). The imaginary part of y is chosen in the interval [−pi/2,pi/2].

One has:

    catanh(z) = 0.5 * clog((1 + z) / (1 − z))

CONFORMING TO

C99

SEE ALSO

atanh(3), cabs(3), cimag(3), complex(7)

COLOPHON

This page is part of release 2.79 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.


  Copyright 2002 Walter Harms (walter.harmsinformatik.uni-oldenburg.de)
Distributed under GPL
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