source: trunk/test/distance_test.cc @ 865

// $Id: distance_test.cc 865 2007-09-10 19:41:04Z peter $

/*
  Copyright (C) 2007 Peter Johansson

  This file is part of the yat library, http://trac.thep.lu.se/trac/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 "yat/classifier/DataLookup1D.h"
#include "yat/statistics/Distance.h"
#include "yat/statistics/Euclidean.h"
#include "yat/statistics/PearsonDistance.h"
#include "yat/utility/vector.h"

#include <cassert>
#include <cmath>
#include <fstream>
#include <iostream>


using namespace theplu::yat;

bool test(const utility::vector&, const utility::vector&, 
          const statistics::Distance*, double, std::ostream*);

int main(const int argc,const char* argv[])

{  
  std::ostream* error;
  if (argc>1 && argv[1]==std::string("-v"))
    error = &std::cerr;
  else {
    error = new std::ofstream("/dev/null");
    if (argc>1)
      std::cout << "distance_test -v : for printing extra information\n";
  }
  *error << "testing distance" << std::endl;
  bool ok = true;

  utility::vector a(3,1);
  a(1) = 2;
  utility::vector b(3,0);
  b(2) = 1;

  *error << "testing PearsonDistance" << std::endl;
  statistics::Distance* distance = new statistics::PearsonDistance;
  ok = ok && test(a, b, distance, 1.5, error);
  delete distance;
  
  *error << "testing Euclidean" << std::endl;
  distance = new statistics::Euclidean;
  ok = ok && test(a, b, distance, 5, error);
  delete distance;
  

  if (error!=&std::cerr)
    delete error;

  if (ok=true)  
    return 0;
  return -1;
}

bool test(const utility::vector& a, const utility::vector& b, 
          const statistics::Distance* distance, double facit, 
          std::ostream* error)
{
  // distance between a and a is always zero
  if (a!=b && !test(a, a, distance, 0, error))
    return false;
  else 
    *error << "Testing that distance between x and x is zero" 
           << std::endl;
  if ((*distance)(a,b) != facit) {
    *error << "Error: calculating distance with utility::vector\n"
           << "       expected " << facit << " got " << (*distance)(a,b)
           << std::endl;
    return false;
  }
  utility::vector ones(a.size(), 1.0);
  if ((*distance)(a,b, ones, ones) != facit) {
    *error << "Error: calculating distance with four utility::vector\n"
           << "       expected " << facit << " got " 
           << (*distance)(a,b, ones, ones)
           << std::endl;
    return false;
  }
  classifier::DataLookup1D a1(a);
  classifier::DataLookup1D b1(b);
  if ((*distance)(a1,b1) != facit) {
    *error << "Error: calculating distance with classifier::DataLookup1D\n"
           << "       expected " << facit << " got " << (*distance)(a1,b1)
           << std::endl;
    return false;
  }
  classifier::DataLookup1D ones1(a1.size(), 1.0);
  if ((*distance)(a1,b1, ones1, ones1) != facit) {
    *error << "Error: calculating distance with four utility::vector\n"
           << "       expected " << facit << " got " 
           << (*distance)(a1,b1, ones1, ones1)
           << std::endl;
    return false;
  }
  
  

  return true;
}