GNU/Linux man pages
Livre :
Expressions régulières,
Syntaxe et mise en oeuvre :
GNU/Linux |
CentOS 5.6 |
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carg(3) |
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carg, cargf, cargl − calculate the 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].
C99
cabs(3), complex(7)
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carg(3) | |