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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | VERSIONS | ATTRIBUTES | CONFORMING TO | SEE ALSO | COLOPHON |
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CARG(3) Linux Programmer's Manual CARG(3)
carg, cargf, cargl - calculate the complex argument
#include <complex.h>
double carg(double complex z);
float cargf(float complex z);
long double cargl(long double complex z);
Link with -lm.
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].
These functions first appeared in glibc in version 2.1.
For an explanation of the terms used in this section, see
attributes(7).
┌──────────────────────────────────────┬───────────────┬─────────┐
│Interface │ Attribute │ Value │
├──────────────────────────────────────┼───────────────┼─────────┤
│carg(), cargf(), cargl() │ Thread safety │ MT-Safe │
└──────────────────────────────────────┴───────────────┴─────────┘
C99, POSIX.1-2001, POSIX.1-2008.
cabs(3), complex(7)
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2021-03-22 CARG(3)
Pages that refer to this page: atan2(3), atan(3), complex(7)
Copyright and license for this manual page
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