source: trunk/yat/statistics/EuclideanDistance.h @ 1051

Last change on this file since 1051 was 1051, checked in by Peter, 14 years ago

file name changes reflecting that distances are now classes

  • Property svn:eol-style set to native
  • Property svn:keywords set to Id
File size: 1.9 KB
Line 
1#ifndef theplu_yat_statistics_euclidean_distance_h
2#define theplu_yat_statistics_euclidean_distance_h
3
4// $Id: EuclideanDistance.h 1051 2008-02-07 18:49:06Z peter $
5
6/*
7  Copyright (C) 2007 Peter Johansson, Markus Ringnér
8  Copyright (C) 2008 Peter Johansson
9
10  This file is part of the yat library, http://trac.thep.lu.se/yat
11
12  The yat library is free software; you can redistribute it and/or
13  modify it under the terms of the GNU General Public License as
14  published by the Free Software Foundation; either version 2 of the
15  License, or (at your option) any later version.
16
17  The yat library is distributed in the hope that it will be useful,
18  but WITHOUT ANY WARRANTY; without even the implied warranty of
19  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20  General Public License for more details.
21
22  You should have received a copy of the GNU General Public License
23  along with this program; if not, write to the Free Software
24  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
25  02111-1307, USA.
26*/
27
28#include "AveragerPair.h"
29#include "AveragerPairWeighted.h"
30#include "yat/utility/iterator_traits.h"
31
32#include <cmath>
33
34namespace theplu {
35namespace yat {
36namespace statistics {
37
38  struct EuclideanDistance
39  {
40    template <typename Iter1, typename Iter2>
41    double operator()
42    (Iter1 beg1,Iter1 end1, Iter2 beg2) const
43    {
44      return this->distance(beg1, end1, beg2, 
45                      typename utility::weighted_if_any2<Iter1,Iter2>::type());
46    }
47
48  private:
49    template <typename Iter1, typename Iter2>
50    double distance (Iter1 beg1,Iter1 end1, Iter2 beg2, 
51                     utility::unweighted_type) const
52    {
53      AveragerPair ap;
54      add(ap,beg1,end1,beg2);
55      return sqrt(ap.sum_squared_deviation());
56    }
57
58    template <typename Iter1, typename Iter2>
59    double distance (Iter1 beg1,Iter1 end1, Iter2 beg2, 
60                     utility::weighted_type) const
61    {
62      AveragerPairWeighted ap;
63      add(ap,beg1,end1,beg2);
64      return sqrt(std::distance(beg1,end1)*ap.msd());
65    }
66   
67  };
68
69}}} // of namespace statistics, yat, and theplu
70   
71#endif
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