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1 | /* $Id$ */ | |
2 | ||
3 | #include "AlidNdEtaCorrection.h" | |
4 | ||
5 | #include <TCanvas.h> | |
6 | #include <TH3F.h> | |
7 | #include <TH1D.h> | |
8 | ||
9 | //____________________________________________________________________ | |
10 | ClassImp(AlidNdEtaCorrection) | |
11 | ||
12 | //____________________________________________________________________ | |
13 | AlidNdEtaCorrection::AlidNdEtaCorrection() | |
14 | : TNamed(), | |
15 | fTrack2ParticleCorrection(0), | |
16 | fVertexRecoCorrection(0), | |
17 | fTriggerCorrection(0), | |
18 | fTriggerBiasCorrection(0), | |
19 | fNEvents(0), | |
20 | fNTriggeredEvents(0) | |
21 | { | |
22 | // default constructor | |
23 | } | |
24 | ||
25 | //____________________________________________________________________ | |
26 | AlidNdEtaCorrection::AlidNdEtaCorrection(const Char_t* name, const Char_t* title) | |
27 | : TNamed(name, title), | |
28 | fNEvents(0), | |
29 | fNTriggeredEvents(0) | |
30 | { | |
31 | // constructor | |
32 | // | |
33 | ||
34 | Float_t binLimitsPt[] = {0.0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.5, 2.0, 10.0, 100.0}; | |
35 | ||
36 | fTrack2ParticleCorrection = new AliCorrectionMatrix3D("nTrackToNPart", "nTrackToNPart", 40, -20, 20, 60, -6, 6, 14, binLimitsPt); | |
37 | ||
38 | Float_t binLimitsN[] = {-0.5, 0.5, 1.5, 2.5, 3.5, 4.5, 5.5, 6.5, 7.5, 8.5, 9.5, | |
39 | 10.5, 12.5, 14.5, 16.5, 18.5, 20.5, 25.5, 30.5, 40.5, 50.5, 100.5, 300.5}; | |
40 | Float_t binLimitsVtx[] = {-20,-15,-10,-6,-3,0,3,6,10,15,20}; | |
41 | ||
42 | fVertexRecoCorrection = new AliCorrectionMatrix2D("vtxReco", "vtxReco",10,binLimitsVtx ,22,binLimitsN); | |
43 | fTriggerCorrection = new AliCorrectionMatrix2D("trigger", "trigger",10,binLimitsVtx ,22,binLimitsN); | |
44 | ||
45 | fTriggerBiasCorrection = new AliCorrectionMatrix2D("triggerBias", "triggerBias",120,-6,6,100, 0, 10); | |
46 | ||
47 | fTrack2ParticleCorrection ->SetAxisTitles("vtx z [cm]", "#eta", "p_{T} [GeV/c]"); | |
48 | fVertexRecoCorrection ->SetAxisTitles("vtx z [cm]", "Ntracks"); | |
49 | fTriggerCorrection ->SetAxisTitles("vtx z [cm]", "Ntracks"); | |
50 | ||
51 | fTriggerBiasCorrection ->SetAxisTitles("#eta", "p_{T} [GeV/c]"); | |
52 | } | |
53 | ||
54 | //____________________________________________________________________ | |
55 | void | |
56 | AlidNdEtaCorrection::Finish() { | |
57 | // | |
58 | // finish method | |
59 | // | |
60 | // divide the histograms in the AliCorrectionMatrix2D objects to get the corrections | |
61 | ||
62 | fTrack2ParticleCorrection->Divide(); | |
63 | ||
64 | TH3F* hist = fTrack2ParticleCorrection->GetCorrectionHistogram(); | |
65 | Int_t emptyBins = 0; | |
66 | for (Int_t x=hist->GetXaxis()->FindBin(-10); x<=hist->GetXaxis()->FindBin(10); ++x) | |
67 | for (Int_t y=hist->GetYaxis()->FindBin(-0.8); y<=hist->GetYaxis()->FindBin(0.8); ++y) | |
68 | for (Int_t z=hist->GetZaxis()->FindBin(0.3); z<=hist->GetZaxis()->FindBin(9.9); ++z) | |
69 | if (hist->GetBinContent(x, y, z) == 0) | |
70 | { | |
71 | printf("Empty bin in fTrack2ParticleCorrection at vtx = %f, eta = %f, pt = %f\n", hist->GetXaxis()->GetBinCenter(x), hist->GetYaxis()->GetBinCenter(y), hist->GetZaxis()->GetBinCenter(z)); | |
72 | ++emptyBins; | |
73 | } | |
74 | ||
75 | printf("INFO: In the central region fTrack2ParticleCorrection has %d empty bins\n", emptyBins); | |
76 | ||
77 | fVertexRecoCorrection->Divide(); | |
78 | fTriggerCorrection->Divide(); | |
79 | ||
80 | if (fNEvents == 0) | |
81 | { | |
82 | printf("ERROR: fNEvents is empty. Cannot scale histogram. Skipping processing of fTriggerBiasCorrection\n"); | |
83 | return; | |
84 | } | |
85 | fTriggerBiasCorrection->GetMeasuredHistogram()->Scale(Double_t(fNTriggeredEvents)/Double_t(fNEvents)); | |
86 | fTriggerBiasCorrection->Divide(); | |
87 | } | |
88 | ||
89 | //____________________________________________________________________ | |
90 | Long64_t | |
91 | AlidNdEtaCorrection::Merge(TCollection* list) { | |
92 | // Merge a list of dNdEtaCorrection objects with this (needed for | |
93 | // PROOF). | |
94 | // Returns the number of merged objects (including this). | |
95 | ||
96 | if (!list) | |
97 | return 0; | |
98 | ||
99 | if (list->IsEmpty()) | |
100 | return 1; | |
101 | ||
102 | TIterator* iter = list->MakeIterator(); | |
103 | TObject* obj; | |
104 | ||
105 | // collections of measured and generated histograms | |
106 | TList* collectionNtrackToNparticle = new TList; | |
107 | TList* collectionVertexReco = new TList; | |
108 | TList* collectionTriggerBias = new TList; | |
109 | ||
110 | Int_t count = 0; | |
111 | while ((obj = iter->Next())) { | |
112 | ||
113 | AlidNdEtaCorrection* entry = dynamic_cast<AlidNdEtaCorrection*> (obj); | |
114 | if (entry == 0) | |
115 | continue; | |
116 | ||
117 | collectionNtrackToNparticle ->Add(entry->GetTrack2ParticleCorrection()); | |
118 | collectionVertexReco ->Add(entry->GetVertexRecoCorrection()); | |
119 | collectionTriggerBias ->Add(entry->GetTriggerBiasCorrection()); | |
120 | ||
121 | count++; | |
122 | } | |
123 | fTrack2ParticleCorrection ->Merge(collectionNtrackToNparticle); | |
124 | fVertexRecoCorrection ->Merge(collectionVertexReco); | |
125 | fTriggerBiasCorrection ->Merge(collectionTriggerBias); | |
126 | ||
127 | delete collectionNtrackToNparticle; | |
128 | delete collectionVertexReco; | |
129 | delete collectionTriggerBias; | |
130 | ||
131 | return count+1; | |
132 | } | |
133 | ||
134 | ||
135 | //____________________________________________________________________ | |
136 | Bool_t | |
137 | AlidNdEtaCorrection::LoadHistograms(Char_t* fileName, Char_t* dir) { | |
138 | // | |
139 | // loads the histograms | |
140 | // | |
141 | ||
142 | fTrack2ParticleCorrection ->LoadHistograms(fileName, dir); | |
143 | fVertexRecoCorrection ->LoadHistograms(fileName, dir); | |
144 | fTriggerCorrection ->LoadHistograms(fileName, dir); | |
145 | fTriggerBiasCorrection ->LoadHistograms(fileName, dir); | |
146 | ||
147 | return kTRUE; | |
148 | } | |
149 | ||
150 | ||
151 | //____________________________________________________________________ | |
152 | void | |
153 | AlidNdEtaCorrection::SaveHistograms() { | |
154 | // | |
155 | // save the histograms | |
156 | // | |
157 | ||
158 | gDirectory->mkdir(fName.Data()); | |
159 | gDirectory->cd(fName.Data()); | |
160 | ||
161 | fTrack2ParticleCorrection->SaveHistograms(); | |
162 | fVertexRecoCorrection->SaveHistograms(); | |
163 | fTriggerCorrection->SaveHistograms(); | |
164 | fTriggerBiasCorrection->SaveHistograms(); | |
165 | ||
166 | gDirectory->cd("../"); | |
167 | } | |
168 | ||
169 | //____________________________________________________________________ | |
170 | void AlidNdEtaCorrection::DrawHistograms() | |
171 | { | |
172 | // | |
173 | // call the draw histogram method of the two AliCorrectionMatrix2D objects | |
174 | ||
175 | fTrack2ParticleCorrection ->DrawHistograms(); | |
176 | fVertexRecoCorrection ->DrawHistograms(); | |
177 | fTriggerCorrection ->DrawHistograms(); | |
178 | fTriggerBiasCorrection ->DrawHistograms(); | |
179 | ||
180 | } | |
181 | ||
182 | //____________________________________________________________________ | |
183 | Float_t AlidNdEtaCorrection::GetMeasuredFraction(Float_t ptCutOff, Float_t eta, Bool_t debug) | |
184 | { | |
185 | // calculates the fraction of particles measured (some are missed due to the pt cut off) | |
186 | // uses the generated particle histogram from fTrack2ParticleCorrection | |
187 | ||
188 | const TH3F* generated = fTrack2ParticleCorrection->GetGeneratedHistogram(); | |
189 | ||
190 | // find eta borders, if eta is negative assume -0.8 ... 0.8 | |
191 | Int_t etaBegin = 0; | |
192 | Int_t etaEnd = 0; | |
193 | if (eta < 0) | |
194 | { | |
195 | etaBegin = generated->GetYaxis()->FindBin(-0.8); | |
196 | etaEnd = generated->GetYaxis()->FindBin(0.8); | |
197 | } | |
198 | else | |
199 | { | |
200 | etaBegin = generated->GetYaxis()->FindBin(eta); | |
201 | etaEnd = etaBegin; | |
202 | } | |
203 | ||
204 | Int_t vertexBegin = generated->GetXaxis()->FindBin(-10); | |
205 | Int_t vertexEnd = generated->GetXaxis()->FindBin(10); | |
206 | ||
207 | TH1D* ptProj = dynamic_cast<TH1D*> (generated->ProjectionZ(Form("%s_pt", generated->GetName()), vertexBegin, vertexEnd, etaBegin, etaEnd)); | |
208 | ptProj->GetXaxis()->SetTitle(generated->GetZaxis()->GetTitle()); | |
209 | ||
210 | Int_t ptBin = ptProj->FindBin(ptCutOff); | |
211 | Float_t abovePtCut = ptProj->Integral(ptBin, ptProj->GetNbinsX()); | |
212 | Float_t all = ptProj->Integral(); | |
213 | ||
214 | if (all == 0) | |
215 | return -1; | |
216 | ||
217 | Float_t fraction = abovePtCut / all; | |
218 | ||
219 | if (debug) | |
220 | { | |
221 | new TCanvas; | |
222 | ptProj->Draw(); | |
223 | } | |
224 | else | |
225 | delete ptProj; | |
226 | ||
227 | return fraction; | |
228 | } | |
229 |