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LSST Data Management Base Package
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Chi2.h
Go to the documentation of this file.
1// -*- LSST-C++ -*-
2/*
3 * This file is part of jointcal.
4 *
5 * Developed for the LSST Data Management System.
6 * This product includes software developed by the LSST Project
7 * (https://www.lsst.org).
8 * See the COPYRIGHT file at the top-level directory of this distribution
9 * for details of code ownership.
10 *
11 * This program is free software: you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation, either version 3 of the License, or
14 * (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program. If not, see <https://www.gnu.org/licenses/>.
23 */
24
25#ifndef LSST_JOINTCAL_CHI2_H
26#define LSST_JOINTCAL_CHI2_H
27
28#include <string>
29#include <iostream>
30#include <sstream>
31#include <utility>
32#include <vector>
33
35
36namespace lsst {
37namespace jointcal {
38
45public:
46 virtual void addEntry(double inc, std::size_t dof, std::shared_ptr<BaseStar> star) = 0;
47
48 virtual ~Chi2Accumulator() = default;;
49};
50
53public:
54 double chi2;
56
57 Chi2Statistic() : chi2(0), ndof(0){};
58
60 s << "chi2/ndof : " << chi2.chi2 << '/' << chi2.ndof << '=' << chi2.chi2 / chi2.ndof;
61 return s;
62 }
63
64 // Addentry has an ignored third argument in order to make it compatible with Chi2List.
65 void addEntry(double inc, std::size_t dof, std::shared_ptr<BaseStar>) override {
66 chi2 += inc;
67 ndof += dof;
68 }
69
71 chi2 += rhs.chi2;
72 ndof += rhs.ndof;
73 return *this;
74 }
75};
76
77/*
78 * A class to accumulate chi2 contributions together with pointers to the contributors.
79 *
80 * This structure lets one compute the chi2 statistics (average and variance) and directly point back
81 * to the bad guys without relooping.
82 * The Chi2Star routine makes it compatible with AstrometryFit's
83 * accumulateStatImage and accumulateStatImageList.
84 */
85struct Chi2Star {
86 double chi2;
88
90 // for sorting
91 bool operator<(Chi2Star const& rhs) const { return (chi2 < rhs.chi2); }
92
93 friend std::ostream& operator<<(std::ostream& s, Chi2Star const& chi2Star) {
94 s << "chi2: " << chi2Star.chi2 << " star: " << *(chi2Star.star) << std::endl;
95 return s;
96 }
97};
98
100class Chi2List : public Chi2Accumulator, public std::vector<Chi2Star> {
101public:
102 void addEntry(double chi2, std::size_t ndof, std::shared_ptr<BaseStar> star) override {
103 push_back(Chi2Star(chi2, std::move(star)));
104 }
105
108
109 friend std::ostream& operator<<(std::ostream& s, Chi2List const& chi2List);
110};
111
112} // namespace jointcal
113} // namespace lsst
114#endif // LSST_JOINTCAL_CHI2_H
Base class for Chi2Statistic and Chi2List, to allow addEntry inside Fitter for either class.
Definition Chi2.h:44
virtual ~Chi2Accumulator()=default
virtual void addEntry(double inc, std::size_t dof, std::shared_ptr< BaseStar > star)=0
Structure to accumulate the chi2 contributions per each star (to help find outliers).
Definition Chi2.h:100
void addEntry(double chi2, std::size_t ndof, std::shared_ptr< BaseStar > star) override
Definition Chi2.h:102
friend std::ostream & operator<<(std::ostream &s, Chi2List const &chi2List)
Definition Chi2.cc:45
std::pair< double, double > computeAverageAndSigma()
Compute the average and std-deviation of these chisq values.
Definition Chi2.cc:33
Simple structure to accumulate chi2 and ndof.
Definition Chi2.h:52
friend std::ostream & operator<<(std::ostream &s, Chi2Statistic const &chi2)
Definition Chi2.h:59
Chi2Statistic & operator+=(Chi2Statistic const &rhs)
Definition Chi2.h:70
void addEntry(double inc, std::size_t dof, std::shared_ptr< BaseStar >) override
Definition Chi2.h:65
T endl(T... args)
T move(T... args)
STL namespace.
Chi2Star push_back(Chi2Star ... args)
Chi2Star(double chi2, std::shared_ptr< BaseStar > star)
Definition Chi2.h:89
bool operator<(Chi2Star const &rhs) const
Definition Chi2.h:91
friend std::ostream & operator<<(std::ostream &s, Chi2Star const &chi2Star)
Definition Chi2.h:93
std::shared_ptr< BaseStar > star
Definition Chi2.h:87