catanh

catanh, catanhf, catanhl - complex arc tangents hyperbolic

#include <complex.h> I double complex catanh(double complex z );
I float complex catanhf(float complex z );
I long double complex catanhl(long double complex z ); Link with -lm.

The R catanh () function calculates the complex atanh(). 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)).

C99

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