CATANH(3) complex math routines CATANH(3)

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);

Link with -lm.

DESCRIPTION The 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)).


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

2002-07-28 CATANH(3)