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[u/mrichter/AliRoot.git] / TPC / AliTPCFitPad.cxx
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10757ee9 1/**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
3 * *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
6 * *
7 * Permission to use, copy, modify and distribute this software and its *
8 * documentation strictly for non-commercial purposes is hereby granted *
9 * without fee, provided that the above copyright notice appears in all *
10 * copies and that both the copyright notice and this permission notice *
11 * appear in the supporting documentation. The authors make no claims *
12 * about the suitability of this software for any purpose. It is *
13 * provided "as is" without express or implied warranty. *
14 **************************************************************************/
15
16////////////////////////////////////////////////////////////////////////////
17//
18// === Class for fitting properties specific to pad regions ===
19//
20// For each pad size region a separate TLinearFitter object is assigned.
21// Commonly used functions such as getting the center of a pad size
22// region or visualization functions are provided. Also, choosing the
23// segment and pad type is made easy due to different methods that
24// can calculate these informations from other coordinates.
25//
26////////////////////////////////////////////////////////////////////////////
27
28#include "AliTPCFitPad.h"
29
30ClassImp(AliTPCFitPad)
31
10757ee9 32
f1c2a4a3 33
10757ee9 34
35AliTPCFitPad::AliTPCFitPad(Int_t ndim, const char* formula, Option_t* opt) :
36 AliTPCCalPadRegion("", ""),
37 fNdim(ndim),
38 fFormula(formula),
39 fOpt(opt)
40{
41 //
42 // Constructor. The parameters are used for generating new TLinearFitter
43 // objects and are described in its documentation.
44 //
45}
46
f1c2a4a3 47AliTPCFitPad& AliTPCFitPad::operator=(const AliTPCFitPad& rhs)
48{
49 //
50 // Assignment operator.
51 //
52
53 if (this != &rhs) {
54 AliTPCCalPadRegion::operator=(rhs);
55 fNdim = rhs.fNdim;
56 fFormula = rhs.fFormula;
57 fOpt = rhs.fOpt;
58 }
59 return *this;
60}
61
62AliTPCFitPad::~AliTPCFitPad() {
10757ee9 63 //
f1c2a4a3 64 // Destructor.
10757ee9 65 //
66
f1c2a4a3 67 Delete();
10757ee9 68}
69
f1c2a4a3 70
71
10757ee9 72void AliTPCFitPad::Add(AliTPCFitPad* fit) {
73 //
74 // Adds another AliTPCFitPad object to this object. The formula should be the
75 // same, though it won't be checked!
76 //
77
78 for (UInt_t iSegment = 0; iSegment < GetNSegments(); iSegment++) {
79 for (UInt_t iPadType = 0; iPadType < GetNPadTypes(); iPadType++) {
80 TLinearFitter* fitter = fit->GetFitterSimple(iSegment, iPadType);
81 // parameter workaround == kTRUE because it is not possible to add another
82 // TLinearFitter object to a "virgin" one. Thus a dummy data point is added
83 // and cleared again immediately afterwards. Due to a broken TLinearFitter
84 // copy constructor this is a necessary workaround.
85 if (fitter) {
86 cout << "TLinearFitter::Add called for " << iSegment << ", " << iPadType << endl;
87 GetFitter(iSegment, iPadType, kTRUE)->Add(fitter);
88 }
89 }
90 }
91}
92
93TLinearFitter* AliTPCFitPad::GetFitterSimple(UInt_t segment, UInt_t padType) {
94 //
95 // This method returns the fitter corresponding to segment and pad type.
96 // In contrast to GetFitter() no fitter will be created, if it does
97 // not exist, but a null pointer is returned.
98 //
99
100 return (TLinearFitter*)(GetObject(segment, padType));
101}
102
103TLinearFitter* AliTPCFitPad::GetFitter(UInt_t segment, UInt_t padType, Bool_t workaround) {
104 //
105 // This method returns the fitter corresponding
106 // to segment and pad type.
107 // If the fitter doesn't exist yet, it will be created on the fly
108 // according to the parameters passed to the constructor.
109 //
110 // The workaround parameter should always be kFALSE. (It is only used by the Add method.)
111 //
112
113 TLinearFitter* fitter = GetFitterSimple(segment, padType);
84e0a111 114 if (fitter == 0 || fitter->GetNumberTotalParameters() !=fNdim) {
115 fitter = new TLinearFitter(fNdim, fFormula, fOpt);
116 SetObject(fitter, segment, padType);
117 fitter = (TLinearFitter*)(GetObject(segment, padType));
118 if (workaround) {
119 Double_t x[1000];
120 for (Int_t i = 0; i < fNdim; i++) x[i] = 3.141592;
121 fitter->AddPoint(x, 31.41592);
122 fitter->ClearPoints();
123 //cout << "workaround called for " << segment << ", " << padType << endl;
124 }
10757ee9 125 }
126 return fitter;
127}
128
129Int_t AliTPCFitPad::Evaluate(Bool_t robust, Double_t frac) {
130 //
131 // Evaluates all fitters. Returns 0 if successful, 1 in case of an error.
132 // If the robust option is set to kTRUE a robust fit is performed with frac as
133 // the minimal fraction of good points (see TLinearFitter::EvalRobust for details).
134 // Beware: Robust fitting is much slower!
135 //
136
137 Int_t returnCode = 0;
138 for (UInt_t iSegment = 0; iSegment < GetNSegments(); iSegment++) {
139 for (UInt_t iPadType = 0; iPadType < GetNPadTypes(); iPadType++) {
140 if (TLinearFitter* fitter = GetFitterSimple(iSegment, iPadType)) {
141 Int_t status = robust ? fitter->EvalRobust(frac) : fitter->Eval();
142 if (status != 0) {
143 returnCode = 1;
144 Error("Evaluate", "Error in evaluation of fitter in segment %d, pad region %d", iSegment, iPadType);
145 }
146 }
147 }
148 }
149 return returnCode;
150}