v7 man page for cacos

Query: cacos

OS: v7

Section: 3

Format: Original Unix Latex Style Formatted with HTML and a Horizontal Scroll Bar

CACOS(3)						     Linux Programmer's Manual							  CACOS(3)

NAME
cacos, cacosf, cacosl - complex arc cosine
SYNOPSIS
#include <complex.h> double complex cacos(double complex z); float complex cacosf(float complex z); long double complex cacosl(long double complex z); Link with -lm.
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))
VERSIONS
These functions first appeared in glibc in version 2.1.
ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7). +-----------------------------+---------------+---------+ |Interface | Attribute | Value | +-----------------------------+---------------+---------+ |cacos(), cacosf(), cacosl() | Thread safety | MT-Safe | +-----------------------------+---------------+---------+
CONFORMING TO
C99, POSIX.1-2001, POSIX.1-2008.
EXAMPLE
/* Link with "-lm" */ #include <complex.h> #include <stdlib.h> #include <unistd.h> #include <stdio.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> ", argv[0]); exit(EXIT_FAILURE); } z = atof(argv[1]) + atof(argv[2]) * I; c = cacos(z); printf("cacos() = %6.3f %6.3f*i ", creal(c), cimag(c)); f = -i * clog(z + i * csqrt(1 - z * z)); printf("formula = %6.3f %6.3f*i ", creal(f), cimag(f)); exit(EXIT_SUCCESS); }
SEE ALSO
ccos(3), clog(3), complex(7)
COLOPHON
This page is part of release 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/. 2015-04-19 CACOS(3)
Related Man Pages
catan(3) - redhat
cacos(3) - minix
cacosh(3) - v7
cacos(3) - x11r4
cacosh(3) - xfree86
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