catanh3
Complex arc tangents hyperbolic
Usage
#include <complex.h>
double complex catanh(double complex z); float complex catanhf(float complex z); long double complex catanhl(long double complex z);
Library
Math library (libm, -lm)
Overview
These functions calculate 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) - clog(1 - z))
Attributes
For an explanation of the terms used in this section, see attributes(7).
| Interface | Attribute | Value |
| catanh(), catanhf(), catanhl() | Thread safety | MT-Safe |
Examples
/* Link with "-lm" */
#include <complex.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
int
main(int argc, char *argv[])
{
double complex z, c, f;
if (argc != 3) {
fprintf(stderr, "Usage: %s <real> <imag>\n", argv[0]);
exit(EXIT_FAILURE);
}
z = atof(argv[1]) + atof(argv[2]) * I;
c = catanh(z);
printf("catanh() = %6.3f %6.3f*i\n", creal(c), cimag(c));
f = 0.5 * (clog(1 + z) - clog(1 - z));
printf("formula = %6.3f %6.3f*i\n", creal(f), cimag(f));
exit(EXIT_SUCCESS);
}
Releases
12 releases since Debian 3.1 (Sarge); the text changed 11 times.