newlib-cygwin/newlib/libm/complex/cabs.c

60 lines
1.2 KiB
C

/* $NetBSD: cabs.c,v 1.1 2007/08/20 16:01:30 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
<<cabs>>, <<cabsf>>, <<cabsl>>---complex absolute-value
INDEX
cabs
INDEX
cabsf
INDEX
cabsl
ANSI_SYNOPSIS
#include <complex.h>
double cabs(double complex <[z]>);
float cabsf(float complex <[z]>);
long double cabsl(long double complex <[z]>);
DESCRIPTION
These functions compute compute the complex absolute value
(also called norm, modulus, or magnitude) of <[z]>.
<<cabsf>> is identical to <<cabs>>, except that it performs
its calculations on <<float complex>>.
<<cabsl>> is identical to <<cabs>>, except that it performs
its calculations on <<long double complex>>.
RETURNS
The cabs* functions return the complex absolute value.
PORTABILITY
<<cabs>>, <<cabsf>> and <<cabsl>> are ISO C99
QUICKREF
<<cabs>>, <<cabsf>> and <<cabsl>> are ISO C99
*/
#include <complex.h>
#include <math.h>
double
cabs(double complex z)
{
return hypot( creal(z), cimag(z) );
}