GNU/Linux man pages
Livre :
Expressions régulières,
Syntaxe et mise en oeuvre :
GNU/Linux |
Debian 7.3.0(Wheezy) |
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cargf(3) |
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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.
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 the range of [−pi,pi].
These functions first appeared in glibc in version 2.1.
C99.
cabs(3), complex(7)
This page is part of release 3.44 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.
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cargf(3) | |