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/*
* Copyright (c) 2005 Philippe Grandclment
*
* This file is part of LORENE.
*
* LORENE 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.
*
* LORENE 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 LORENE; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
char et_bin_nsbh_angul_C[] = "$Header: /cvsroot/Lorene/C++/Source/Etoile/et_bin_nsbh_angul.C,v 1.5 2014/10/13 08:52:56 j_novak Exp $" ;
/*
* $Id: et_bin_nsbh_angul.C,v 1.5 2014/10/13 08:52:56 j_novak Exp $
* $Log: et_bin_nsbh_angul.C,v $
* Revision 1.5 2014/10/13 08:52:56 j_novak
* Lorene classes and functions now belong to the namespace Lorene.
*
* Revision 1.4 2014/10/06 15:13:08 j_novak
* Modified #include directives to use c++ syntax.
*
* Revision 1.3 2005/08/31 09:53:19 m_saijo
* Delete unnecessary words around headers
*
* Revision 1.2 2005/08/31 09:13:45 p_grandclement
* add math.h
*
* Revision 1.1 2005/08/29 15:10:16 p_grandclement
* Addition of things needed :
* 1) For BBH with different masses
* 2) Provisory files for the mixted binaries (Bh and NS) : THIS IS NOT
* WORKING YET !!!
*
*
* $Header: /cvsroot/Lorene/C++/Source/Etoile/et_bin_nsbh_angul.C,v 1.5 2014/10/13 08:52:56 j_novak Exp $
*
*/
// C Headers
#include <cmath>
// Headers Lorene
#include "et_bin_nsbh.h"
#include "graphique.h"
namespace Lorene {
double Et_bin_nsbh::compute_angul() const {
// On rcupre les trucs qui vont servir :
Cmp dx_mu (nnn().dsdx() / nnn());
Cmp dx_loggam (loggam().dsdx()) ;
double part_dx = dx_mu(0,0,0,0) + dx_loggam(0,0,0,0) ;
Cmp xabs (mp) ;
xabs = mp.xa ;
Cmp yabs (mp) ;
yabs = mp.ya ;
// Derivee_square
Cmp G_square_cmp (-pow(confpsi(), 4)/nnn()/nnn()*(xabs*xabs+yabs*yabs)) ;
G_square_cmp.std_base_scal() ;
double dG_square = G_square_cmp.dsdx()(0,0,0,0) ;
// Derive single
Cmp G_single_cmp (-2*pow(confpsi(), 4)/nnn()/nnn()*(shift(1)*xabs-shift(0)*yabs)) ;
G_single_cmp.std_base_scal() ;
double dG_single = G_single_cmp.dsdx()(0,0,0,0) ;
// Derive const
Cmp G_const_cmp = 1-pow(confpsi(), 4)/nnn()/nnn()*(shift(0)*shift(0) + shift(1)*shift(1) + shift(2)*shift(2)) ;
G_const_cmp.std_base_scal() ;
double dG_const = G_const_cmp.dsdx()(0,0,0,0) ;
// coefficients de G
double G_square = G_square_cmp (0,0,0,0) ;
double G_single = G_single_cmp (0,0,0,0) ;
double G_const = G_const_cmp (0,0,0,0) ;
// Les coefficients du polynome :
double a_coef = dG_square + 2*G_square*part_dx ;
double b_coef = dG_single + 2*G_single*part_dx ;
double c_coef = dG_const + 2*G_const *part_dx;
double determinant = b_coef*b_coef - 4*a_coef*c_coef ;
bool soluce = true ;
double res ;
if (determinant <0) {
soluce = false ;
}
else {
double sol_un = (-b_coef - sqrt(determinant))/2/a_coef ;
double sol_deux = (-b_coef + sqrt(determinant))/2/a_coef ;
bool signe_un = (sol_un >0) ? true : false ;
bool signe_deux = (sol_deux >0) ? true : false ;
if (signe_un == signe_deux) {
soluce = false ;
}
else {
res = (signe_un) ? sol_un : sol_deux ;
}
}
if (soluce == false)
return 0 ;
else
return res ;
}
}
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