source: trunk/yat/statistics/AveragerPairWeighted.cc @ 1486

Last change on this file since 1486 was 1486, checked in by Jari Häkkinen, 13 years ago

Addresses #436.

  • Property svn:eol-style set to native
  • Property svn:keywords set to Id
File size: 2.5 KB
Line 
1// $Id: AveragerPairWeighted.cc 1486 2008-09-09 21:17:19Z jari $
2
3/*
4  Copyright (C) 2005 Peter Johansson, Markus Ringnér
5  Copyright (C) 2006, 2007 Jari Häkkinen, Peter Johansson, Markus Ringnér
6  Copyright (C) 2008 Peter Johansson
7
8  This file is part of the yat library, http://dev.thep.lu.se/yat
9
10  The yat library is free software; you can redistribute it and/or
11  modify it under the terms of the GNU General Public License as
12  published by the Free Software Foundation; either version 3 of the
13  License, or (at your option) any later version.
14
15  The yat library is distributed in the hope that it will be useful,
16  but WITHOUT ANY WARRANTY; without even the implied warranty of
17  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18  General Public License for more details.
19
20  You should have received a copy of the GNU General Public License
21  along with this program; if not, write to the Free Software
22  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
23  02111-1307, USA.
24*/
25
26#include "AveragerPairWeighted.h"
27#include "AveragerPair.h"
28#include "Averager.h"
29
30#include <cassert>
31
32namespace theplu {
33namespace yat {
34namespace statistics {
35
36
37  AveragerPairWeighted::AveragerPairWeighted(void)
38    : wxy_(0), w_(0)
39  {
40  }
41
42
43  void  AveragerPairWeighted::add(const double x, const double y, 
44                                  const double wx, const double wy)
45  { 
46    if(wx==0.0 || wy==0.0) {
47      return;
48    }
49    assert(!std::isnan(x) && "x is nan");
50    assert(!std::isnan(y) && "y is nan");
51    assert(!std::isnan(wx) && "wx is nan");
52    assert(!std::isnan(wy) && "wy is nan");
53    double w=wx*wy;
54    x_.add(x,w);
55    y_.add(y,w); 
56    wxy_ += w*x*y;   
57    w_ +=w;
58  }
59
60
61  double AveragerPairWeighted::correlation(void) const
62  {
63    return covariance() / sqrt(x_.variance()*y_.variance());
64  }
65
66
67  double AveragerPairWeighted::covariance(void) const
68  {
69    return sum_xy_centered()/sum_w();
70  }
71
72
73  double AveragerPairWeighted::msd(void) const
74  {
75    return (x_.sum_wxx()+y_.sum_wxx()-2*wxy_)/w_;
76  }
77
78
79  double AveragerPairWeighted::n(void) const
80  {
81    return x_.n();
82  }
83
84
85  void AveragerPairWeighted::reset(void)
86  {
87    x_.reset(); y_.reset(); wxy_=0; w_=0;
88  }
89
90
91  double AveragerPairWeighted::sum_w(void) const
92  {
93    return w_;
94  }
95
96
97  double AveragerPairWeighted::sum_xy(void) const
98  {
99    return wxy_;
100  }
101
102
103  double AveragerPairWeighted::sum_xy_centered(void) const
104  {
105    return sum_xy() - x_.sum_wx()*y_.mean();
106  }
107
108
109  const AveragerWeighted& AveragerPairWeighted::x_averager(void) const
110  {
111    return x_;
112  }
113
114
115  const AveragerWeighted& AveragerPairWeighted::y_averager(void) const
116  {
117    return y_;
118  }
119
120}}} // of namespace statistics, yat, and theplu
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