PearsonDistance.h

#ifndef theplu_yat_statistics_pearson_distance_h
#define theplu_yat_statistics_pearson_distance_h

// $Id: PearsonDistance.h 2202 2010-02-21 18:39:13Z peter $

/*
  Copyright (C) 2007, 2008 Jari Häkkinen, Peter Johansson, Markus Ringnér
  Copyright (C) 2010 Peter Johansson

  This file is part of the yat library, http://dev.thep.lu.se/yat

  The yat library 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.

  The yat library 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 yat. If not, see <http://www.gnu.org/licenses/>.
*/

#include "averager_traits.h"
#include "yat/utility/iterator_traits.h"

namespace theplu {
namespace yat {
namespace statistics {

  struct PearsonDistance
  {
    template <typename ForwardIterator1, typename ForwardIterator2>
    double operator()(ForwardIterator1 beg1, ForwardIterator1 end1, 
                      ForwardIterator2 beg2) const
    {
      typename averager_pair<ForwardIterator1, ForwardIterator2>::type ap;
      add(ap,beg1,end1,beg2);
      return 1-ap.correlation();
    }
  };

}}} // of namespace statistics, yat, and theplu
    
#endif