cacosf(3) Linux Man Page - System Grab Bag

Name

cacos, cacosf, cacosl - complex arc cosine

Library

Math library ( libm ", " -lm )

Synopsis

#include <complex.h> 
double complex cacos(double complex  z );
float complex cacosf(float complex  z );
long double complex cacosl(long double complex  z );

Description

These functions calculate the complex arc cosine of z. If y\ =\ cacos(z), then z\ =\ ccos(y). The real part of y is chosen in the interval [0,pi].

One has:

    cacos(z) = -i * clog(z + i * csqrt(1 - z * z))

Attributes

For an explanation of the terms used in this section, see attributes(7). allbox; lbx lb lb T{ cacos()cacosf()cacosl()

Interface	Attribute	Value
T}	Thread safety	MT-Safe

Standards

C11, POSIX.1-2008.

History

glibc 2.1. C99, POSIX.1-2001.

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;
    double complex i = I;

    if (argc != 3) {
        fprintf(stderr, "Usage: %s <real> <imag>\en", argv[0]);
        exit(EXIT_FAILURE);
    }

    z = atof(argv[1]) + atof(argv[2]) * I;

    c = cacos(z);

    printf("cacos() = %6.3f %6.3f*i\en", creal(c), cimag(c));

    f = -i * clog(z + i * csqrt(1 - z * z));

    printf("formula = %6.3f %6.3f*i\en", creal(f), cimag(f));

    exit(EXIT_SUCCESS);
}