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<html> <head> <title>cargf</title> <META NAME="KEYWORDS" CONTENT="cargf"> </head> <body BGCOLOR="#ffffff" LINK="#0000ff" VLINK="#0000ff" ALINK="#0000ff" TEXT="#000000"> <center> <h1><b>cargf</b></h1></center> <PRE> <STRONG><A HREF="/man3/CARG">CARG(3)</A></STRONG> Linux Programmer's Manual <STRONG><A HREF="/man3/CARG">CARG(3)</A></STRONG> NAME carg, cargf, cargl - calculate the complex argument SYNOPSIS #include <complex.h> double carg(double complex z); float cargf(float complex z); long double cargl(long double complex z); Link with -lm. DESCRIPTION These functions calculate the complex argument (also called phase an- gle) of z, with a branch cut along the negative real axis. A complex number can be described by two real coordinates. One may use rectangular coordinates and gets z = x + I * y where x = creal(z) and y = cimag(z). Or one may use polar coordinates and gets z = r * cexp(I * a) where r = cabs(z) is the "radius", the "modulus", the absolute value of z, and a = carg(z) is the "phase angle", the argument of z. One has: tan(carg(z)) = cimag(z) / creal(z) RETURN VALUE The return value is the range of [-pi,pi]. VERSIONS These functions first appeared in glibc in version 2.1. ATTRIBUTES For an explanation of the terms used in this section, see at- <STRONG><A HREF="/man7/tributes">tributes(7)</A></STRONG>. +-------------------------+---------------+---------+ |Interface | Attribute | Value | +-------------------------+---------------+---------+ |carg(), cargf(), cargl() | Thread safety | MT-Safe | +-------------------------+---------------+---------+ CONFORMING TO C99, POSIX.1-2001, POSIX.1-2008. SEE ALSO <STRONG><A HREF="/man3/cabs">cabs(3)</A></STRONG>, <STRONG><A HREF="/man7/complex">complex(7)</A></STRONG> COLOPHON This page is part of release 5.05 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/. 2017-09-15 <STRONG><A HREF="/man3/CARG">CARG(3)</A></STRONG></PRE> <center> <h6>Man Pages Copyright Respective Owners. Site Copyright (C) 1994 - 2025 <a href="http://www.he.net">Hurricane Electric</a>. All Rights Reserved.</h6></center> </body> </html>