catanh, catanhf, catanhl — complex arc tangents hyperbolic
#include <complex.h>
double complex catanh( |
double complex | z); |
float
complex catanhf( |
float complex | z); |
long
double complex catanhl( |
long double complex | z); |
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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))
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Copyright 2002 Walter Harms (walter.harmsinformatik.uni-oldenburg.de) Distributed under GPL |