carg - Online Linux Manual PageSection : 3
Updated : 2022-12-15
Source : Linux man-pages 6.03

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NAMEcarg, cargf, cargl − calculate the complex argument

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LIBRARYMath library (libm, −lm)

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SYNOPSIS#include <complex.h>double carg(double complex z); float cargf(float complex z); long double cargl(long double complex z);

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DESCRIPTIONThese functions calculate the complex argument (also called phase angle) 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 * ywhere 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)

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RETURN VALUEThe return value is in the range of [−pi,pi].

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VERSIONSThese functions were added in glibc 2.1.

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ATTRIBUTESFor an explanation of the terms used in this section, see attributes(7). InterfaceAttributeValue carg(), cargf(), cargl() Thread safetyMT-Safe

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STANDARDSC99, POSIX.1-2001, POSIX.1-2008.

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SEE ALSOcabs(3), complex(7) 0

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