]>
Commit | Line | Data |
---|---|---|
97e94238 | 1 | /* Copyright (C) 2007 Christian Holm Christensen <cholm@nbi.dk> |
2 | * | |
3 | * This library is free software; you can redistribute it and/or | |
4 | * modify it under the terms of the GNU Lesser General Public License | |
5 | * as published by the Free Software Foundation; either version 2.1 of | |
6 | * the License, or (at your option) any later version. | |
7 | * | |
8 | * This library is distributed in the hope that it will be useful, but | |
9 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * Lesser General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU Lesser General Public | |
14 | * License along with this library; if not, write to the Free Software | |
15 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 | |
16 | * USA | |
17 | */ | |
18 | //___________________________________________________________________ | |
19 | /** @file | |
20 | @brief Example | |
21 | ||
22 | Compile and run like | |
23 | @verbatim | |
24 | Root> gSystem->Load("libFMDflow.so"); | |
25 | Root> gSystem->AddIncludePath("-I$ALICE_ROOT/FMD") | |
26 | Root> .x FMD/flow/TestFlow.C | |
27 | @endverbatim | |
28 | ||
29 | or | |
30 | @verbatim | |
31 | $ g++ `root-config --cflags --libs` -I$ALICE_ROOT/include \ | |
32 | -I$ALICE_ROOT/FMD $ALICE_ROOT/FMD/flow/TestFlow.C -o testflow | |
33 | $ ./testflow | |
34 | @endverbatim | |
35 | */ | |
790a8a94 | 36 | #include <FMD/flow/AliFMDFlowBinned1D.h> |
37 | #include <FMD/flow/AliFMDFlowTrue.h> | |
38 | #include <FMD/flow/AliFMDFlowUtil.h> | |
39 | #include <TRandom.h> | |
40 | #include <TCanvas.h> | |
41 | #include <TVirtualPad.h> | |
42 | #include <TArrayD.h> | |
43 | #include <TBrowser.h> | |
44 | #include <iostream> | |
45 | #include <TMath.h> | |
46 | #include <TH2.h> | |
47 | #include <TStyle.h> | |
9b98d361 | 48 | #include <TFile.h> |
790a8a94 | 49 | |
50 | //____________________________________________________________________ | |
97e94238 | 51 | /** Generate events */ |
790a8a94 | 52 | struct Generator |
53 | { | |
97e94238 | 54 | /** Constructor |
55 | @param psi Possibly fixed event plane (if <0 -> random) | |
56 | @param v1 value of v1 | |
57 | @param v2 value of v2 | |
58 | @param min Minimum number of observations | |
59 | @param max Maximum number of observations */ | |
790a8a94 | 60 | Generator(Double_t psi=-1, |
61 | Double_t v1=.05, Double_t v2=.05, | |
62 | UInt_t min=100, UInt_t max=1000) | |
63 | : fPsi(psi), fV1(v1), fV2(v2), fMin(min), fMax(max) | |
64 | {} | |
97e94238 | 65 | /** Prepare for the next event. |
66 | @return Number of observations */ | |
790a8a94 | 67 | UInt_t Prepare() |
68 | { | |
69 | // Generate a uniform random direction | |
70 | fN = 0; | |
71 | if (fPsi >= 0) fPsiR = fPsi; | |
72 | else fPsiR = gRandom->Uniform(0, 2 * TMath::Pi()); | |
73 | return unsigned(gRandom->Uniform(fMin, fMax)); | |
74 | } | |
97e94238 | 75 | /** Create an observation */ |
790a8a94 | 76 | Double_t operator()() |
77 | { | |
78 | // Generate a uniform random direction | |
79 | Double_t phi = gRandom->Uniform(0, 2 * TMath::Pi()); | |
80 | Double_t rel = phi - fPsiR; | |
81 | Double_t dphi = -2 * TMath::Sin(rel) * fV1; | |
82 | dphi -= TMath::Sin(2 * rel) * fV2; | |
83 | phi += dphi; | |
84 | return phi; | |
85 | } | |
97e94238 | 86 | /** Get the event plane */ |
790a8a94 | 87 | Double_t Psi() const { return fPsiR; } |
88 | Double_t fPsi; | |
89 | Double_t fPsiR; | |
90 | Double_t fV1; | |
91 | Double_t fV2; | |
92 | Double_t fMin; | |
93 | Double_t fMax; | |
94 | UInt_t fN; | |
95 | }; | |
96 | ||
97e94238 | 97 | /** Run test program */ |
790a8a94 | 98 | void |
9b98d361 | 99 | TestFlow(UInt_t n_events=100, Int_t seg=-1, UInt_t n_max=20000, |
100 | Float_t v2=0.05) | |
790a8a94 | 101 | { |
9b98d361 | 102 | Generator generator(-1, 0.00, v2, n_max, n_max); |
790a8a94 | 103 | AliFMDFlowAxis a(10, -5, 5); |
9b98d361 | 104 | AliFMDFlowBinned1D flow("test","Test",2, 1, a); |
105 | AliFMDFlowTrue1D real("true","true", 2, a); | |
106 | TH2D hist("hist","hist",a.N(),a.Bins(), | |
107 | (seg>0?seg:90),0, 2* TMath::Pi()); | |
108 | TH1D rela("rela","real", | |
109 | (seg>0?seg:90),0, 2* TMath::Pi()); | |
790a8a94 | 110 | Double_t dphi = (seg <= 0 ? 0 : 2 * TMath::Pi() / seg); |
9b98d361 | 111 | TArrayD phis(n_max); |
112 | TArrayD tphis(n_max); | |
113 | TArrayD xs(n_max); | |
114 | flow.SetLineColor(kRed+2); | |
115 | real.SetLineColor(kBlue+2); | |
116 | rela.SetXTitle("#Psi_{R}"); | |
117 | rela.SetYTitle("#Psi_{2}"); | |
118 | ||
790a8a94 | 119 | std::cout << std::endl; |
120 | for (UInt_t i = 0; i < n_events; i++) { | |
121 | std::cout << "\rEvent # " << i << std::flush; | |
122 | // Generate an event, get the number of objects, get the true | |
123 | // event plane, shuffle the phis around randomly. | |
124 | UInt_t n_obs = generator.Prepare(); | |
125 | Double_t rpsi_r = NormalizeAngle(generator.Psi()); | |
790a8a94 | 126 | |
9b98d361 | 127 | real.SetPsi(rpsi_r); |
790a8a94 | 128 | std::cout << " (" << n_obs << " observations)" << std::flush; |
129 | for (UInt_t j = 0; j < n_obs; j++) { | |
130 | if (j % 2000 == 0) std::cout << "." << std::flush; | |
131 | Double_t x = gRandom->Gaus(0, 3); | |
132 | Double_t phi = generator(); | |
133 | tphis[j] = phi; | |
134 | if (seg >= 0) { | |
135 | Int_t iseg = Int_t(phi / dphi); | |
136 | phi = dphi * (iseg + .5); | |
137 | } | |
790a8a94 | 138 | phis[j] = phi; |
139 | xs[j] = x; | |
9b98d361 | 140 | hist.Fill(x, NormalizeAngle(phi-rpsi_r)); |
141 | rela.Fill(NormalizeAngle(phi-rpsi_r)); | |
790a8a94 | 142 | } |
9b98d361 | 143 | flow.Event(n_obs, phis.fArray, xs.fArray); |
144 | real.Event(n_obs, tphis.fArray, xs.fArray); | |
790a8a94 | 145 | } |
146 | std::cout << std::endl; | |
9b98d361 | 147 | flow.Print("s"); |
148 | real.Print("s"); | |
790a8a94 | 149 | |
150 | gStyle->SetPalette(1); | |
151 | ||
152 | TCanvas* c = new TCanvas("C"); | |
153 | c->SetFillColor(0); | |
9b98d361 | 154 | c->Divide(2,2); |
790a8a94 | 155 | TVirtualPad* p = c->cd(1); |
9b98d361 | 156 | // p->Divide(1,2); |
157 | // p = p->cd(1); | |
790a8a94 | 158 | p->SetFillColor(0); |
9b98d361 | 159 | flow.Draw("th:"); |
160 | real.Draw("th:same"); | |
161 | // p = c->cd(1); | |
162 | p = c->cd(2); | |
163 | rela.Scale(1. / n_events); | |
164 | rela.Draw(""); | |
165 | p = c->cd(3); | |
790a8a94 | 166 | p->SetFillColor(0); |
9b98d361 | 167 | flow.Draw("tr:"); |
168 | real.Draw("tr:same"); | |
169 | c->cd(4); | |
170 | hist.Scale(1. / n_events); | |
171 | hist.Draw("lego2"); | |
172 | TBrowser* b = new TBrowser("b"); | |
173 | b->Add(&flow); | |
174 | b->Add(&real); | |
175 | ||
176 | TFile* file = TFile::Open("flow_test.root", "RECREATE"); | |
177 | flow.Write(); | |
178 | real.Write(); | |
179 | file->Close(); | |
180 | delete file; | |
790a8a94 | 181 | } |
182 | ||
183 | #ifndef __CINT__ | |
184 | #include <TApplication.h> | |
97e94238 | 185 | /** Entry point for test program */ |
790a8a94 | 186 | int |
187 | main() | |
188 | { | |
189 | TApplication app("app", 0, 0); | |
190 | TestFlow(); | |
191 | app.Run(); | |
192 | } | |
193 | ||
194 | #endif | |
195 | ||
196 |