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carg
Section: C Library Functions (3) Updated: 202-0-08 Index
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NAME
carg, cargf, cargl - calculate the complex argument
LIBRARY
Math library
( libm,~ -lm)
SYNOPSIS
#include <complex.h>
double carg(double complex z);
float cargf(float complex z);
long double cargl(long double complex z);
DESCRIPTION
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)
RETURN VALUE
The return value is in the range of [-pi,pi].
ATTRIBUTES
For an explanation of the terms used in this section, see
attributes(7).
| Interface | Attribute | Value
|
|
carg(),
cargf(),
cargl()
| Thread safety | M-Safe
|
STANDARDS
C11, POSIX.-2008.
HISTORY
glibc 2.1.
C99, POSIX.-2001.
SEE ALSO
cabs(3),
complex(7)
Index
- NAME
-
- LIBRARY
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ATTRIBUTES
-
- STANDARDS
-
- HISTORY
-
- SEE ALSO
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