NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ATTRIBUTES | STANDARDS | HISTORY | SEE ALSO | COLOPHON |
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carg(3) Library Functions Manual carg(3)
carg, cargf, cargl - calculate the complex argument
Math library (libm, -lm)
#include <complex.h> double carg(double complex z); float cargf(float complex z); long double cargl(long double complex z);
These 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 * 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)
The return value is in the range of [-pi,pi].
For an explanation of the terms used in this section, see attributes(7). ┌─────────────────────────────────────┬───────────────┬─────────┐ │ Interface │ Attribute │ Value │ ├─────────────────────────────────────┼───────────────┼─────────┤ │ carg(), cargf(), cargl() │ Thread safety │ MT-Safe │ └─────────────────────────────────────┴───────────────┴─────────┘
C11, POSIX.1-2008.
glibc 2.1. C99, POSIX.1-2001.
cabs(3), complex(7)
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Linux man-pages 6.9.1 2024-05-02 carg(3)
Pages that refer to this page: atan2(3), atan(3), complex(7)