1CARG(3)                    Linux Programmer's Manual                   CARG(3)
2
3
4

NAME

6       carg, cargf, cargl - calculate the complex argument
7

SYNOPSIS

9       #include <complex.h>
10
11       double carg(double complex z);
12       float cargf(float complex z);
13       long double cargl(long double complex z);
14
15       Link with -lm.
16

DESCRIPTION

18       These  functions  calculate  the  complex  argument  (also called phase
19       angle) of z, with a branch cut along the negative real axis.
20
21       A complex number can be described by two real coordinates.  One may use
22       rectangular coordinates and gets
23
24           z = x + I * y
25
26       where x = creal(z) and y = cimag(z).
27
28       Or one may use polar coordinates and gets
29
30           z = r * cexp(I * a)
31
32       where r = cabs(z) is the "radius", the "modulus", the absolute value of
33       z, and a = carg(z) is the "phase angle", the argument of z.
34
35       One has:
36
37           tan(carg(z)) = cimag(z) / creal(z)
38

RETURN VALUE

40       The return value is the range of [-pi,pi].
41

VERSIONS

43       These functions first appeared in glibc in version 2.1.
44

ATTRIBUTES

46       For  an  explanation  of  the  terms  used   in   this   section,   see
47       attributes(7).
48
49       ┌─────────────────────────┬───────────────┬─────────┐
50Interface                Attribute     Value   
51       ├─────────────────────────┼───────────────┼─────────┤
52carg(), cargf(), cargl() │ Thread safety │ MT-Safe │
53       └─────────────────────────┴───────────────┴─────────┘

CONFORMING TO

55       C99, POSIX.1-2001, POSIX.1-2008.
56

SEE ALSO

58       cabs(3), complex(7)
59

COLOPHON

61       This  page  is  part of release 5.02 of the Linux man-pages project.  A
62       description of the project, information about reporting bugs,  and  the
63       latest     version     of     this    page,    can    be    found    at
64       https://www.kernel.org/doc/man-pages/.
65
66
67
68                                  2017-09-15                           CARG(3)
Impressum