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Reference Guide
TUnuranEmpDist.cxx
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1 // @(#)root/unuran:$Id$
2 // Authors: L. Moneta, J. Leydold Wed Feb 28 2007
3 
4 /**********************************************************************
5  * *
6  * Copyright (c) 2006 LCG ROOT Math Team, CERN/PH-SFT *
7  * *
8  * *
9  **********************************************************************/
10 
11 // Implementation file for class TUnuranEmpDist
12 
13 #include "TUnuranEmpDist.h"
14 
15 #include "TH1.h"
16 
17 #include <cassert>
18 
19 
20 
21 TUnuranEmpDist::TUnuranEmpDist (const TH1 * h1, bool useBuffer) :
22  fDim(0),
23  fMin(0),
24  fMax(0),
25  fBinned(false)
26 {
27  //Constructor from a TH1 objects.
28  //The buffer of the histo, if available, can be used for
29  // the estimation of the parent distribution using smoothing
30 
31  if (!h1) return; // in case of default ctor for I/O
32 
33  fDim = h1->GetDimension();
34 
35  bool unbin = useBuffer && h1->GetBufferLength() > 0 ;
36  fBinned = !unbin;
37 
38  if (fBinned ) {
39  int nbins = h1->GetNbinsX();
40  fData.reserve(nbins);
41  for (int i =0; i < nbins; ++i)
42  fData.push_back( h1->GetBinContent(i+1) );
43 
44  fMin = h1->GetXaxis()->GetXmin();
45  fMax = h1->GetXaxis()->GetXmax();
46  }
47  else {
48  //std::cout << "use kernel smoothing method" << std::endl;
49 
50  int n = h1->GetBufferLength();
51  const double * bf = h1->GetBuffer();
52  fData.reserve(n);
53  // fill buffer (assume weights are equal to 1)
54  // bugger is : [n,w0,x0,y0,..,w1,x1,y1,...wn,xn,yn]
55  // buffer contains size
56  for (int i = 0; i < n; ++i) {
57  int index = (fDim+1)*i + fDim + 1;
58  fData.push_back( bf[index] );
59  }
60  }
61 }
62 
63 TUnuranEmpDist::TUnuranEmpDist (unsigned int n, double * x) :
64  fData(std::vector<double>(x,x+n) ),
65  fDim(1),
66  fMin(0), fMax(0),
67  fBinned(0)
68 {
69  // constructor for 1D unbinned data
70 }
71 
72 TUnuranEmpDist::TUnuranEmpDist (unsigned int n, double * x, double * y) :
73  fData(std::vector<double>(2*n) ),
74  fDim(2),
75  fMin(0), fMax(0),
76  fBinned(0)
77 {
78  // constructor for 2D unbinned data
79  for (unsigned int i = 0; i < n; ++i) {
80  fData[i*2] = x[i];
81  fData[i*2+1] = y[i];
82  }
83 }
84 
85 TUnuranEmpDist::TUnuranEmpDist (unsigned int n, double * x, double * y, double *z) :
86  fData(std::vector<double>(3*n) ),
87  fDim(3),
88  fMin(0), fMax(0),
89  fBinned(0)
90 {
91  // constructor for 3D unbinned data
92  for (unsigned int i = 0; i < n; ++i) {
93  fData[i*3] = x[i];
94  fData[i*3+1] = y[i];
95  fData[i*3+2] = z[i];
96  }
97 }
98 
99 
100 
103 {
104  // Implementation of copy ctor using aassignment operator
105  operator=(rhs);
106 }
107 
109 {
110  // Implementation of assignment operator (copy only the function pointer not the function itself)
111  if (this == &rhs) return *this; // time saving self-test
112  fData = rhs.fData;
113  fDim = rhs.fDim;
114  fMin = rhs.fMin;
115  fMax = rhs.fMax;
116  fBinned = rhs.fBinned;
117  return *this;
118 }
119 
120 
121 
122 
123 
124 
TUnuranBaseDist, base class for Unuran distribution classees such as TUnuranContDist (for one-dimensi...
virtual Double_t GetBinContent(Int_t bin) const
Return content of bin number bin.
Definition: TH1.cxx:4763
TUnuranEmpDist & operator=(const TUnuranEmpDist &rhs)
Assignment operator.
STL namespace.
virtual Int_t GetDimension() const
Definition: TH1.h:277
Double_t GetXmin() const
Definition: TAxis.h:133
Double_t x[n]
Definition: legend1.C:17
const Double_t * GetBuffer() const
Definition: TH1.h:233
TH1F * h1
Definition: legend1.C:5
TUnuranEmpDist class for describing empiral distributions.
std::vector< double > fData
TUnuranEmpDist(const TH1 *h1=0, bool useBuffer=true)
Constructor from a TH1 objects.
Double_t y[n]
Definition: legend1.C:17
The TH1 histogram class.
Definition: TH1.h:56
you should not use this method at all Int_t Int_t z
Definition: TRolke.cxx:630
Int_t GetBufferLength() const
Definition: TH1.h:231
virtual Int_t GetNbinsX() const
Definition: TH1.h:291
Double_t GetXmax() const
Definition: TAxis.h:134
const Int_t n
Definition: legend1.C:16
unsigned int fDim
TAxis * GetXaxis()
Get the behaviour adopted by the object about the statoverflows. See EStatOverflows for more informat...
Definition: TH1.h:315