2017-04-11 21:13:36 +00:00
|
|
|
/* $NetBSD: carg.c,v 1.1 2007/08/20 16:01:31 drochner Exp $ */
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* Written by Matthias Drochner <drochner@NetBSD.org>.
|
|
|
|
|
* Public domain.
|
|
|
|
|
*
|
|
|
|
|
* imported and modified include for newlib 2010/10/03
|
|
|
|
|
* Marco Atzeri <marco_atzeri@yahoo.it>
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
FUNCTION
|
|
|
|
|
<<carg>>, <<cargf>>---argument (phase angle)
|
|
|
|
|
|
|
|
|
|
INDEX
|
|
|
|
|
carg
|
|
|
|
|
INDEX
|
|
|
|
|
cargf
|
|
|
|
|
|
2018-12-28 15:30:48 +00:00
|
|
|
SYNOPSIS
|
2017-04-11 21:13:36 +00:00
|
|
|
#include <complex.h>
|
|
|
|
|
double carg(double complex <[z]>);
|
|
|
|
|
float cargf(float complex <[z]>);
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
DESCRIPTION
|
|
|
|
|
These functions compute the argument (also called phase angle)
|
|
|
|
|
of <[z]>, with a branch cut along the negative real axis.
|
|
|
|
|
|
|
|
|
|
<<cargf>> is identical to <<carg>>, except that it performs
|
|
|
|
|
its calculations on <<floats complex>>.
|
|
|
|
|
|
|
|
|
|
RETURNS
|
|
|
|
|
@ifnottex
|
|
|
|
|
The carg functions return the value of the argument in the
|
|
|
|
|
interval [-pi, +pi]
|
|
|
|
|
@end ifnottex
|
|
|
|
|
@tex
|
|
|
|
|
The carg functions return the value of the argument in the
|
|
|
|
|
interval [$-\pi$, $+\pi$]
|
|
|
|
|
@end tex
|
|
|
|
|
|
|
|
|
|
PORTABILITY
|
|
|
|
|
<<carg>> and <<cargf>> are ISO C99
|
|
|
|
|
|
|
|
|
|
QUICKREF
|
|
|
|
|
<<carg>> and <<cargf>> are ISO C99
|
|
|
|
|
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
#include <complex.h>
|
|
|
|
|
#include <math.h>
|
|
|
|
|
|
|
|
|
|
double
|
|
|
|
|
carg(double complex z)
|
|
|
|
|
{
|
|
|
|
|
|
|
|
|
|
return atan2( cimag(z) , creal(z) );
|
|
|
|
|
}
|
