85 lines
2.9 KiB
C++
85 lines
2.9 KiB
C++
/***************************************************************************
|
|
|
|
PGlobalChiSquare.cpp
|
|
|
|
Author: Andreas Suter
|
|
e-mail: andreas.suter@psi.ch
|
|
|
|
$Id$
|
|
|
|
***************************************************************************/
|
|
|
|
/***************************************************************************
|
|
* Copyright (C) 2007 by Andreas Suter *
|
|
* andreas.suter@psi.ch *
|
|
* *
|
|
* 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 program; if not, write to the *
|
|
* Free Software Foundation, Inc., *
|
|
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
|
|
***************************************************************************/
|
|
|
|
#include <math.h>
|
|
|
|
#include <iostream>
|
|
|
|
#include "PGlobalChiSquare.h"
|
|
|
|
namespace ROOT {
|
|
namespace Minuit2 {
|
|
|
|
//--------------------------------------------------------------------------
|
|
/**
|
|
* <p>
|
|
*/
|
|
PGlobalChiSquare::PGlobalChiSquare(PRunList &runList)
|
|
{
|
|
fRunList = runList;
|
|
}
|
|
|
|
//--------------------------------------------------------------------------
|
|
/**
|
|
* <p>
|
|
*/
|
|
PGlobalChiSquare::~PGlobalChiSquare()
|
|
{
|
|
}
|
|
|
|
//--------------------------------------------------------------------------
|
|
/**
|
|
* <p>
|
|
*
|
|
* \param par
|
|
*/
|
|
double PGlobalChiSquare::operator()(const std::vector<double>& par) const
|
|
{
|
|
double chi2 = 0.0;
|
|
double funcValue;
|
|
double diff;
|
|
|
|
// calculate chi2 for the given model
|
|
for (unsigned int i=0; i<fRunList.size(); i++) { // run loop
|
|
for (unsigned int j=0; j<fRunList[i].fTime.size(); j++) { // data loop
|
|
funcValue = par[i]*exp(-par[2]*fRunList[i].fTime[j]); // par[i] since par[0] = ampl of run 0, etc.
|
|
diff = funcValue - fRunList[i].fValue[j];
|
|
chi2 += diff*diff/(fRunList[i].fError[j]*fRunList[i].fError[j]);
|
|
}
|
|
}
|
|
|
|
return chi2;
|
|
}
|
|
|
|
} // namespace Minuit2
|
|
} // namespace ROOT
|
|
|