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EvtdFunction.cpp
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EvtdFunction.cpp
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/***********************************************************************
* Copyright 1998-2020 CERN for the benefit of the EvtGen authors *
* *
* This file is part of EvtGen. *
* *
* EvtGen 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 3 of the License, or *
* (at your option) any later version. *
* *
* EvtGen 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 EvtGen. If not, see <https://www.gnu.org/licenses/>. *
***********************************************************************/
#include "EvtGenBase/EvtdFunction.hh"
#include "EvtGenBase/EvtPatches.hh"
#include "EvtGenBase/EvtdFunctionSingle.hh"
#include <assert.h>
#include <iostream>
#include <math.h>
#include <stdlib.h>
double EvtdFunction::d( int j, int m1, int m2, double theta )
{
int m1p = m1;
int m2p = m2;
int signp = 1;
//make |m2p|>|m1p|
if ( abs( m2p ) < abs( m1p ) ) {
int tmp = m1p;
m1p = m2p;
m2p = tmp;
if ( ( m1p - m2p ) % 4 != 0 )
signp = -signp;
}
//make m2p non-negative
if ( m2p < 0 ) {
m1p = -m1p;
m2p = -m2p;
if ( ( m1p - m2p ) % 4 != 0 )
signp = -signp;
}
EvtdFunctionSingle df;
df.init( j, m1p, m2p );
double d = df.d( j, m1p, m2p, theta ) * signp;
return d;
}

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