source: trunk/yat/statistics/Histogram.cc @ 1706

Last change on this file since 1706 was 1487, checked in by Jari Häkkinen, 13 years ago

Addresses #436. GPL license copy reference should also be updated.

  • Property svn:eol-style set to native
  • Property svn:keywords set to Author Date Id Revision
File size: 3.7 KB
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1// $Id: Histogram.cc 1487 2008-09-10 08:41:36Z jari $
2
3/*
4  Copyright (C) 2004 Jari Häkkinen
5  Copyright (C) 2005 Peter Johansson
6  Copyright (C) 2006 Jari Häkkinen
7  Copyright (C) 2007 Jari Häkkinen, Peter Johansson
8  Copyright (C) 2008 Peter Johansson
9
10  This file is part of the yat library, http://dev.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 3 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 yat. If not, see <http://www.gnu.org/licenses/>.
24*/
25
26#include "Histogram.h"
27
28#include <cmath>
29#include <fstream>
30
31namespace theplu {
32namespace yat {
33namespace statistics {
34
35
36  Histogram::Histogram(void)
37    : xmax_(0), xmin_(0), sum_all_(), sum_histogram_()
38  {
39  }
40
41
42  Histogram::Histogram(const Histogram& b)
43  {
44    *this=b;
45  }
46
47
48  Histogram::Histogram(const double min, const double max, const size_t n)
49    : histogram_(std::vector<double>(n,0.0)),
50      xmax_(max), xmin_(min),
51      sum_all_(), sum_histogram_()
52  {
53  }
54
55
56  Histogram::~Histogram(void)
57  {
58  }
59
60
61  int Histogram::add(const double x, const double w)
62  {
63    sum_all_.add(x,w);
64    if (x<xmin_)
65      return -1;
66    else if (x>=xmax_)
67      return 1;
68
69    sum_histogram_.add(x,w);
70    histogram_[bin(x)] += w;
71    return 0;
72  }
73
74
75  const AveragerWeighted& Histogram::averager_all(void) const
76  {
77    return sum_all_;
78  }
79
80
81  const AveragerWeighted& Histogram::averager_histogram(void) const
82  {
83    return sum_histogram_;
84  }
85
86
87  size_t Histogram::bin(double d)
88  {
89    return (((d<xmin_) || (d>xmax_)) ? 0 :
90            static_cast<size_t>(floor((d-xmin_)/spacing() )));
91  }
92
93
94  size_t Histogram::nof_bins(void) const
95  {
96    return histogram_.size();
97  }
98
99
100  void Histogram::normalize(bool choice)
101  {
102    double scale_factor;
103    if (choice) 
104      scale_factor = sum_all_.sum_w();
105    else
106      scale_factor = sum_all_.sum_w()*spacing();
107    for (size_t i=0; i<histogram_.size(); i++)
108      histogram_[i]/=scale_factor;
109  }
110
111
112  double Histogram::observation_value(const size_t k) const
113  {
114    return xmin_+spacing()*(k+0.5);
115  }
116
117
118  void Histogram::reset(void)
119  {
120    for (size_t i=0; i<histogram_.size(); i++)
121      histogram_[i]=0;
122    sum_all_.reset();
123    sum_histogram_.reset();
124  }
125
126
127  double Histogram::spacing(void) const
128  {
129    return (xmax_-xmin_)/nof_bins();
130  }
131
132
133  double Histogram::xmax(void) const
134  {
135    return xmax_;
136  }
137
138
139  double Histogram::xmin(void) const
140  {
141    return xmin_;
142  }
143
144
145  double Histogram::operator[](size_t k) const
146  {
147    return histogram_[k];
148  }
149
150
151  const Histogram& Histogram::operator=(const Histogram& b)
152  {
153    if (this==&b)
154      return *this;
155    histogram_=b.histogram_;
156    xmax_=b.xmax_;
157    xmin_=b.xmin_;
158    sum_all_=b.sum_all_;
159    sum_histogram_=b.sum_histogram_;
160    return *this;
161  }
162
163
164  std::ostream& operator<<(std::ostream& s,const Histogram& histogram)
165  {
166    s << "# histogram min : " << histogram.xmin() << '\n';
167    s << "# histogram max : " << histogram.xmax() << '\n';
168    s << "# number of bins: " << histogram.nof_bins() << '\n';
169    s << "# nof points in histogram : " 
170      << histogram.averager_histogram().sum_w() << '\n';
171    s << "# nof points in total:      " 
172      << histogram.averager_all().sum_w() << '\n';
173    s << "# column 1: center of observation bin\n"
174      << "# column 2: frequency\n";
175
176    for (size_t i=0; i<histogram.nof_bins(); i++) {
177      s.width(12);
178      s << histogram.observation_value(i);
179      s.width(12);
180      s << histogram[i] << '\n';
181    }
182
183    return s;
184  }
185
186}}} // of namespace statistics, yat, and theplu
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