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/*
* units.h - some conversion definitions
*
* Copyright (C) 1992-2011 jean-pierre.charras
* Copyright The KiCad Developers, see AUTHORS.txt for contributors.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this package; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#ifndef __UNITS_H
#define __UNITS_H
#include <config.h>
#include <cmath>
#include "units_scales.h"
#ifndef HAVE_CMATH_ASINH
inline double asinh( double x )
{
return log( x+sqrt(x*x+1) );
}
#endif
#ifndef HAVE_CMATH_ACOSH
inline double acosh( double x )
{
// must be x>=1, if not return Nan (Not a Number)
if( x < 1.0 ) return sqrt( -1.0 );
// return only the positive result (as sqrt does).
return log( x+sqrt( x*x-1.0 ) );
}
#endif
#ifndef HAVE_CMATH_ATANH
inline double atanh( double x )
{
// must be x>-1, x<1, if not return Nan (Not a Number)
if( !(x>-1.0 && x<1.0) ) return sqrt( -1.0 );
return log( (1.0+x)/(1.0-x) ) / 2.0;
}
#endif
#define MU0 12.566370614e-7 // magnetic constant
#define C0 299792458.0 // speed of light in vacuum
#define ZF0 376.730313668 // wave resistance in vacuum
// const to convert a attenuation / loss from log (Neper) to decibel
// (1 Np = 8.68589 dB)
const double LOG2DB = 20.0 / log( 10.0 );
// ZF0 value update:
// https://physics.nist.gov/cgi-bin/cuu/Value?z0
#endif /* __UNITS_H */
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