source: trunk/yat/statistics/WilcoxonFoldChange.cc @ 1275

// $Id: WilcoxonFoldChange.cc 1275 2008-04-11 06:10:12Z jari $

/*
  Copyright (C) 2005 Peter Johansson
  Copyright (C) 2006, 2007 Jari Häkkinen, Peter Johansson
  Copyright (C) 2008 Peter Johansson

  This file is part of the yat library, http://trac.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 2 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 this program; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  02111-1307, USA.
*/

#include "WilcoxonFoldChange.h"
#include "utility.h"
#include "yat/classifier/Target.h"

#include <cmath>
#include <vector>
#include <iostream>

namespace theplu {
namespace yat {
namespace statistics {


  WilcoxonFoldChange::WilcoxonFoldChange(bool absolute)
    : Score(absolute)
  {
  }


  double WilcoxonFoldChange::score(const classifier::Target& target, 
                                   const utility::VectorBase& value) const
  {
    std::vector<double> distance;
    //Peter, should reserve the vector to avoid reallocations   
    for (size_t i=0; i<target.size(); i++) {
      if (target(i)!=1) continue;
      for (size_t j=0; j<target.size(); j++) {
        if (target(j)==1) continue;
        distance.push_back(value(i)-value(j));
      }
    }
    if (absolute_)
      return fabs(median(distance.begin(), distance.end()));
    return median(distance.begin(), distance.end());
  }


  double WilcoxonFoldChange::score
  (const classifier::Target& target, 
   const classifier::DataLookupWeighted1D& value) const
  {
    std::cerr << " WilcoxonFoldChange::score  not implemented" << std::endl;
    return 0;
  }


  double WilcoxonFoldChange::score(const classifier::Target& target, 
                                   const utility::VectorBase& value,
                                   const utility::VectorBase& weight) const
  {
    std::cerr << " WilcoxonFoldChange::score  not implemented" << std::endl;
    return 0;
  }

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