PWG0/AliCorrection.cxx

   1 /* $Id$ */
   2
   3 // ------------------------------------------------------
   4 //
   5 // Class to handle corrections.
   6 //
   7 // ------------------------------------------------------
   8 //
   9
  10 #include <TFile.h>
  11 #include <TCanvas.h>
  12 #include <TH3F.h>
  13 #include <TH2F.h>
  14
  15 #include <AliLog.h>
  16 #include "AliCorrectionMatrix2D.h"
  17 #include "AliCorrectionMatrix3D.h"
  18
  19 #include "AliCorrection.h"
  20
  21 //____________________________________________________________________
  22 ClassImp(AliCorrection)
  23
  24 //____________________________________________________________________
  25 AliCorrection::AliCorrection() : TNamed(),
  26   fEventCorr(0),
  27   fTrackCorr(0)
  28 {
  29   // default constructor
  30 }
  31
  32 //____________________________________________________________________
  33 AliCorrection::AliCorrection(const Char_t* name, const Char_t* title, const char* analysis) : TNamed(name, title),
  34   fEventCorr(0),
  35   fTrackCorr(0)
  36 {
  37   // constructor initializing tnamed
  38
  39   Float_t* binLimitsPt = 0;
  40   Int_t nBinsPt = 0;
  41
  42   // different binnings, better solution could be anticipated...
  43   if (TString(analysis).CompareTo("tpc", TString::kIgnoreCase) == 0)
  44   {
  45     static Float_t binLimitsPtTmp[] = {0.0, 0.05, 0.1, 0.125, 0.15, 0.175, 0.2, 0.225, 0.25, 0.275, 0.3, 0.325, 0.35, 0.375, 0.4, 0.425, 0.45, 0.475, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.5, 2.0, 5.0, 10.0, 100.0};
  46     binLimitsPt = (Float_t*) binLimitsPtTmp;
  47     nBinsPt = 28;
  48   } else if (TString(analysis).CompareTo("spd", TString::kIgnoreCase) == 0)
  49   {
  50     static Float_t binLimitsPtTmp[] = {-0.5, 0.5};
  51     binLimitsPt = (Float_t*) binLimitsPtTmp;
  52     nBinsPt = 1;
  53   }
  54
  55   if (!binLimitsPt)
  56   {
  57     Printf("FATAL: Invalid binning");
  58     return;
  59   }
  60
  61   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, 10.5, 12.5, 14.5, 16.5, 18.5, 20.5, 25.5, 30.5, 40.5, 50.5, 100.5, 300.5};
  62   //Float_t binLimitsVtx[] = {-20,-15,-10,-6,-3,0,3,6,10,15,20};
  63   //Float_t binLimitsVtx[] = {-20,-19,-18,-17,-16,-15,-14,-13,-12,-11,-10,-9,-8,-7,-6,-5,-4,-3,-2,-1,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20};
  64   Float_t binLimitsVtx[] = {-20,-15,-10,-8,-6,-4,-2,0,2,4,6,8,10,15,20};
  65   Float_t binLimitsEta[] = {-2,-1.9,-1.8,-1.7,-1.6,-1.5,-1.4,-1.3,-1.2,-1.1,-1.0,-0.9,-0.8,-0.7,-0.6,-0.5,-0.4,-0.3,-0.2,-0.1,0.0,0.1,0.2,0.3,0.4,0.5,0.6,0.7,0.8,0.9,1.0,1.1,1.2,1.3,1.4,1.5,1.6,1.7,1.8,1.9,2.0};
  66 //  Float_t binLimitsEta[] = { -7.0, -6.9, -6.8, -6.7, -6.6, -6.5, -6.4, -6.3, -6.2, -6.1, -6.0, -5.9, -5.8, -5.7, -5.6, -5.5, -5.4, -5.3, -5.2, -5.1, -5.0, -4.9, -4.8, -4.7, -4.6, -4.5, -4.4, -4.3, -4.2, -4.1, -4.0, -3.9, -3.8, -3.7, -3.6, -3.5, -3.4, -3.3, -3.2, -3.1, -3.0, -2.9, -2.8, -2.7, -2.6, -2.5, -2.4, -2.3, -2.2, -2.1, -2.0, -1.9, -1.8, -1.7, -1.6, -1.5, -1.4, -1.3, -1.2, -1.1, -1.0, -0.9, -0.8, -0.7, -0.6, -0.5, -0.4, -0.3, -0.2, -0.1, -0.0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3.0, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4.0, 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.7, 4.8, 4.9, 5.0, 5.1, 5.2, 5.3, 5.4, 5.5, 5.6, 5.7, 5.8, 5.9, 6.0, 6.1, 6.2, 6.3, 6.4, 6.5, 6.6, 6.7, 6.8, 6.9, 7.0 };
  67
  68   TH3F* dummyBinning = new TH3F("dummyBinning","dummyBinning",14, binLimitsVtx, 40, binLimitsEta , nBinsPt, binLimitsPt);
  69
  70   fEventCorr = new AliCorrectionMatrix2D("EventCorrection", Form("%s EventCorrection", fTitle.Data()), 14, binLimitsVtx, 22, binLimitsN);
  71   fTrackCorr = new AliCorrectionMatrix3D("TrackCorrection", Form("%s TrackCorrection", fTitle.Data()), dummyBinning);
  72
  73   delete dummyBinning;
  74
  75   fEventCorr->SetAxisTitles("vtx z [cm]", "Ntracks");
  76   fTrackCorr->SetAxisTitles("vtx z [cm]", "#eta", "p_{T} [GeV/c]");
  77 }
  78
  79 //____________________________________________________________________
  80 AliCorrection::AliCorrection(const AliCorrection& c) : TNamed(c),
  81   fEventCorr(0),
  82   fTrackCorr(0)
  83 {
  84   // copy constructor
  85   ((AliCorrection &)c).Copy(*this);
  86 }
  87
  88 //____________________________________________________________________
  89 AliCorrection::~AliCorrection()
  90 {
  91   //
  92   // destructor
  93   //
  94
  95   if (fEventCorr)
  96   {
  97     delete fEventCorr;
  98     fEventCorr = 0;
  99   }
 100
 101   if (fTrackCorr)
 102   {
 103     delete fTrackCorr;
 104     fTrackCorr = 0;
 105   }
 106 }
 107
 108 //____________________________________________________________________
 109 AliCorrection &AliCorrection::operator=(const AliCorrection &c)
 110 {
 111   // assigment operator
 112
 113   if (this != &c)
 114     ((AliCorrection &) c).Copy(*this);
 115
 116   return *this;
 117 }
 118
 119 //____________________________________________________________________
 120 void AliCorrection::Copy(TObject& c) const
 121 {
 122   // copy function
 123
 124   AliCorrection& target = (AliCorrection &) c;
 125
 126   if (fEventCorr)
 127     target.fEventCorr = dynamic_cast<AliCorrectionMatrix2D*> (fEventCorr->Clone());
 128
 129   if (fTrackCorr)
 130     target.fTrackCorr = dynamic_cast<AliCorrectionMatrix3D*> (fTrackCorr->Clone());
 131 }
 132
 133 //____________________________________________________________________
 134 Long64_t AliCorrection::Merge(TCollection* list)
 135 {
 136   // Merge a list of AliCorrection objects with this (needed for
 137   // PROOF).
 138   // Returns the number of merged objects (including this).
 139
 140   if (!list)
 141     return 0;
 142
 143   if (list->IsEmpty())
 144     return 1;
 145
 146   TIterator* iter = list->MakeIterator();
 147   TObject* obj;
 148
 149   // collections of measured and generated histograms
 150   TList* collectionEvent = new TList;
 151   TList* collectionTrack = new TList;
 152
 153   Int_t count = 0;
 154   while ((obj = iter->Next())) {
 155
 156     AliCorrection* entry = dynamic_cast<AliCorrection*> (obj);
 157     if (entry == 0)
 158       continue;
 159
 160     collectionEvent->Add(entry->fEventCorr);
 161     collectionTrack->Add(entry->fTrackCorr);
 162
 163     count++;
 164   }
 165   fEventCorr->Merge(collectionEvent);
 166   fTrackCorr->Merge(collectionTrack);
 167
 168   delete collectionEvent;
 169   delete collectionTrack;
 170
 171   return count+1;
 172 }
 173
 174 //____________________________________________________________________
 175 void AliCorrection::Divide()
 176 {
 177   //
 178   // divide the histograms to get the correction
 179   //
 180
 181   if (!fEventCorr || !fTrackCorr)
 182     return;
 183
 184   fEventCorr->Divide();
 185   fTrackCorr->Divide();
 186
 187   Int_t emptyBins = fTrackCorr->CheckEmptyBins(-9.99, 9.99, -0.79, 0.79, 0.3, 4.9);
 188   printf("INFO: In the central region the track correction of %s has %d empty bins\n", GetName(), emptyBins);
 189 }
 190
 191 //____________________________________________________________________
 192 void AliCorrection::Add(AliCorrection* aCorrectionToAdd, Float_t c)
 193 {
 194   //
 195   // add to measured and generated the measured and generated of aCorrectionToAdd
 196   // with the weight c
 197
 198   fEventCorr->Add(aCorrectionToAdd->GetEventCorrection(),c);
 199   fTrackCorr->Add(aCorrectionToAdd->GetTrackCorrection(),c);
 200 }
 201
 202
 203 //____________________________________________________________________
 204 Bool_t AliCorrection::LoadHistograms(const Char_t* dir)
 205 {
 206   //
 207   // loads the histograms from a file
 208   // if dir is empty a directory with the name of this object is taken (like in SaveHistogram)
 209   //
 210
 211   if (!fEventCorr || !fTrackCorr)
 212     return kFALSE;
 213
 214   if (!dir)
 215     dir = GetName();
 216
 217   if (!gDirectory->cd(dir))
 218     return kFALSE;
 219
 220   Bool_t success = fEventCorr->LoadHistograms();
 221   success &= fTrackCorr->LoadHistograms();
 222
 223   gDirectory->cd("..");
 224
 225   return success;
 226 }
 227
 228 //____________________________________________________________________
 229 void AliCorrection::SaveHistograms()
 230 {
 231   //
 232   // saves the histograms in a directory with the name of this object (GetName)
 233   //
 234
 235   gDirectory->mkdir(GetName());
 236   gDirectory->cd(GetName());
 237
 238   if (fEventCorr)
 239     fEventCorr->SaveHistograms();
 240
 241   if (fTrackCorr)
 242     fTrackCorr->SaveHistograms();
 243
 244   gDirectory->cd("..");
 245 }
 246
 247 //____________________________________________________________________
 248 void AliCorrection::ReduceInformation()
 249 {
 250   // this function deletes the measured and generated histograms to reduce the amount of data
 251   // in memory
 252
 253   if (!fEventCorr || !fTrackCorr)
 254     return;
 255
 256   fEventCorr->ReduceInformation();
 257   fTrackCorr->ReduceInformation();
 258 }
 259
 260 //____________________________________________________________________
 261 void AliCorrection::Reset(Option_t* option)
 262 {
 263   // resets the histograms
 264
 265   if (fEventCorr)
 266     fEventCorr->Reset(option);
 267
 268   if (fTrackCorr)
 269     fTrackCorr->Reset(option);
 270 }
 271
 272 //____________________________________________________________________
 273 void AliCorrection::DrawHistograms(const Char_t* name)
 274 {
 275   // draws the corrections
 276
 277   if (!name)
 278     name = GetName();
 279
 280   if (fEventCorr)
 281     fEventCorr->DrawHistograms(Form("%s event", name));
 282
 283   if (fTrackCorr)
 284     fTrackCorr->DrawHistograms(Form("%s track", name));
 285 }
 286
 287 void AliCorrection::DrawOverview(const char* canvasName)
 288 {
 289   // draw projection of the corrections
 290   //   to the 3 axis of fTrackCorr and 2 axis of fEventCorr
 291
 292   TString canvasNameTmp(GetName());
 293   if (canvasName)
 294     canvasNameTmp = canvasName;
 295
 296   TCanvas* canvas = new TCanvas(canvasNameTmp, canvasNameTmp, 1200, 800);
 297   canvas->Divide(3, 2);
 298
 299   if (fTrackCorr) {
 300     canvas->cd(1);
 301     fTrackCorr->Get1DCorrectionHistogram("x", 0.3, 5, -1, 1)->DrawCopy()->GetYaxis()->SetRangeUser(0, 10);
 302
 303     canvas->cd(2);
 304     fTrackCorr->Get1DCorrectionHistogram("y", 0.3, 5, 0, 0)->DrawCopy()->GetYaxis()->SetRangeUser(0, 10);
 305
 306     canvas->cd(3);
 307     fTrackCorr->Get1DCorrectionHistogram("z", 0, -1, -1, 1)->DrawCopy()->GetYaxis()->SetRangeUser(0, 10);
 308   }
 309
 310   if (fEventCorr)
 311   {
 312     canvas->cd(4);
 313     fEventCorr->Get1DCorrectionHistogram("x")->DrawCopy();
 314
 315     canvas->cd(5);
 316     fEventCorr->Get1DCorrectionHistogram("y")->DrawCopy()->GetXaxis()->SetRangeUser(0, 30);
 317   }
 318 }
 319
 320 //____________________________________________________________________
 321 void AliCorrection::SetCorrectionToUnity()
 322 {
 323   // set the corrections to unity
 324
 325   if (fEventCorr)
 326     fEventCorr->SetCorrectionToUnity();
 327
 328   if (fTrackCorr)
 329     fTrackCorr->SetCorrectionToUnity();
 330 }
 331
 332 //____________________________________________________________________
 333 void AliCorrection::Multiply()
 334 {
 335   // call Multiply
 336
 337   if (fEventCorr)
 338   {
 339     fEventCorr->Multiply();
 340     // now we manually copy the overflow bin of the y axis (multiplicity) over. This is important to get the event count correct
 341     TH2F* hist = fEventCorr->GetMeasuredHistogram();
 342     for (Int_t x = 1; x <= hist->GetNbinsX(); ++x)
 343       fEventCorr->GetGeneratedHistogram()->SetBinContent(x, hist->GetNbinsY() + 1, hist->GetBinContent(x, hist->GetNbinsY() + 1));
 344   }
 345
 346   if (fTrackCorr)
 347     fTrackCorr->Multiply();
 348 }
 349
 350 //____________________________________________________________________
 351 void AliCorrection::Scale(Double_t factor)
 352 {
 353   // scales the two contained corrections
 354
 355   fEventCorr->Scale(factor);
 356   fTrackCorr->Scale(factor);
 357 }
 358
 359 //____________________________________________________________________
 360 void AliCorrection::PrintInfo(Float_t ptCut)
 361 {
 362   // prints some stats
 363
 364   TH3* measured = GetTrackCorrection()->GetMeasuredHistogram();
 365   TH3* generated = GetTrackCorrection()->GetGeneratedHistogram();
 366
 367   TH2* measuredEvents = GetEventCorrection()->GetMeasuredHistogram();
 368   TH2* generatedEvents = GetEventCorrection()->GetGeneratedHistogram();
 369
 370   Printf("tracks measured: %.1f tracks generated: %.1f, events measured: %1.f, events generated %1.f", measured->Integral(), generated->Integral(), measuredEvents->Integral(), generatedEvents->Integral());
 371
 372   // normalize to number of events;
 373   measured->Scale(1.0 / measuredEvents->Integral());
 374   generated->Scale(1.0 / generatedEvents->Integral());
 375
 376   Float_t nMeasured = measured->Integral(-1, -1, -1, -1, measured->GetZaxis()->FindBin(ptCut), measured->GetZaxis()->GetNbins());
 377   Float_t nGenerated = generated->Integral(-1, -1, -1, -1, generated->GetZaxis()->FindBin(ptCut), generated->GetZaxis()->GetNbins());
 378
 379   Printf("%.2f tracks/event measured, %.2f tracks after correction --> effective average correction factor is %.2f (pt cut %.2f GeV/c)", nMeasured, nGenerated, nGenerated / nMeasured, ptCut);
 380 }