TPC/AliTPCComparison.C

   1 struct GoodTrack {
   2   Int_t lab;
   3   Int_t code;
   4   Float_t px,py,pz;
   5   Float_t x,y,z;
   6 };
   7 Int_t good_tracks(GoodTrack *gt, Int_t max);
   8
   9 Int_t AliTPCComparison() {
  10    cerr<<"Doing comparison...\n";
  11
  12    TFile *cf=TFile::Open("AliTPCclusters.root");
  13    if (!cf->IsOpen()) {cerr<<"Can't open AliTPCclusters.root !\n"; return 1;}
  14    AliTPCParam *digp= (AliTPCParam*)cf->Get("75x40_100x60");
  15    if (!digp) { cerr<<"TPC parameters have not been found !\n"; return 2; }
  16
  17 // Load clusters
  18    AliTPCClustersArray *ca=new AliTPCClustersArray;
  19    ca->Setup(digp);
  20    ca->SetClusterType("AliTPCcluster");
  21    ca->ConnectTree("Segment Tree");
  22    Int_t nentr=Int_t(ca->GetTree()->GetEntries());
  23    for (Int_t i=0; i<nentr; i++) {
  24        AliSegmentID *s=ca->LoadEntry(i);
  25    }
  26
  27 // Load tracks
  28    TFile *tf=TFile::Open("AliTPCtracks.root");
  29    if (!tf->IsOpen()) {cerr<<"Can't open AliTPCtracks.root !\n"; return 3;}
  30    TObjArray tarray(2000);
  31    TTree *tracktree=(TTree*)tf->Get("TreeT");
  32    TBranch *tbranch=tracktree->GetBranch("tracks");
  33    Int_t nentr=tracktree->GetEntries();
  34    for (i=0; i<nentr; i++) {
  35        AliTPCtrack *iotrack=new AliTPCtrack;
  36        tbranch->SetAddress(&iotrack);
  37        tracktree->GetEvent(i);
  38        iotrack->CookLabel(ca);
  39        tarray.AddLast(iotrack);
  40    }
  41    tf->Close();
  42
  43    delete ca;
  44    cf->Close();
  45
  46 /////////////////////////////////////////////////////////////////////////
  47    GoodTrack gt[7000];
  48    Int_t ngood=0;
  49    ifstream in("good_tracks");
  50    if (in) {
  51       cerr<<"Reading good tracks...\n";
  52       while (in>>gt[ngood].lab>>gt[ngood].code
  53                >>gt[ngood].px >>gt[ngood].py>>gt[ngood].pz
  54                >>gt[ngood].x  >>gt[ngood].y >>gt[ngood].z) {
  55          ngood++;
  56          cerr<<ngood<<'\r';
  57          if (ngood==7000) {
  58             cerr<<"Too many good tracks !\n";
  59             break;
  60          }
  61       }
  62       if (!in.eof()) cerr<<"Read error (good_tracks) !\n";
  63    } else {
  64       cerr<<"Marking good tracks (this will take a while)...\n";
  65       ngood=good_tracks(gt,7000);
  66       ofstream out("good_tracks");
  67       if (out) {
  68          for (Int_t ngd=0; ngd<ngood; ngd++)
  69             out<<gt[ngd].lab<<' '<<gt[ngd].code<<' '
  70                <<gt[ngd].px <<' '<<gt[ngd].py<<' '<<gt[ngd].pz<<' '
  71                <<gt[ngd].x  <<' '<<gt[ngd].y <<' '<<gt[ngd].z <<endl;
  72       } else cerr<<"Can not open file (good_tracks) !\n";
  73       out.close();
  74    }
  75    cerr<<"Number of good tracks : "<<ngood<<endl;
  76
  77    cerr<<"Doing comparison...\n";
  78    TH1F *hp=new TH1F("hp","PHI resolution",50,-20.,20.); hp->SetFillColor(4);
  79    TH1F *hl=new TH1F("hl","LAMBDA resolution",50,-20,20);hl->SetFillColor(4);
  80    TH1F *hpt=new TH1F("hpt","Relative Pt resolution",30,-10.,10.);
  81    hpt->SetFillColor(2);
  82    TH1F *hmpt=new TH1F("hmpt","Relative Pt resolution (pt>4GeV/c)",30,-60,60);
  83    hmpt->SetFillColor(6);
  84
  85    TH1F *hgood=new TH1F("hgood","Good tracks",20,0,7);
  86    TH1F *hfound=new TH1F("hfound","Found tracks",20,0,7);
  87    TH1F *hfake=new TH1F("hfake","Fake tracks",20,0,7);
  88    TH1F *hg=new TH1F("hg","",20,0,7); //efficiency for good tracks
  89    hg->SetLineColor(4); hg->SetLineWidth(2);
  90    TH1F *hf=new TH1F("hf","Efficiency for fake tracks",20,0,7);
  91    hf->SetFillColor(1); hf->SetFillStyle(3013); hf->SetLineWidth(2);
  92
  93    TH1F *he =new TH1F("he","dE/dX for pions with 0.4<p<0.5 GeV/c",50,0.,100.);
  94    TH2F *hep=new TH2F("hep","dE/dX vs momentum",50,0.,2.,50,0.,200.);
  95
  96    while (ngood--) {
  97       Int_t lab=gt[ngood].lab,tlab;
  98       Float_t ptg=
  99       TMath::Sqrt(gt[ngood].px*gt[ngood].px + gt[ngood].py*gt[ngood].py);
 100
 101       hgood->Fill(ptg);
 102
 103       AliTPCtrack *track;
 104       Int_t i;
 105       for (i=0; i<nentr; i++) {
 106           track=(AliTPCtrack*)tarray->UncheckedAt(i);
 107           tlab=track->GetLabel();
 108           if (lab==TMath::Abs(tlab)) break;
 109       }
 110       if (i==nentr) {
 111         cerr<<"Track "<<lab<<" was not found !\n";
 112         continue;
 113       }
 114       Double_t xk=gt[ngood].x;//digp->GetPadRowRadii(0,0);
 115       track->PropagateTo(xk);
 116
 117       if (lab==tlab) hfound->Fill(ptg);
 118       else { hfake->Fill(ptg); cerr<<lab<<" fake\n";}
 119
 120       Double_t px,py,pz,pt=fabs(track->GetPt());track->GetPxPyPz(px,py,pz);
 121
 122       if (TMath::Abs(gt[ngood].code)==11 && ptg>4.) {
 123          hmpt->Fill((1/pt - 1/ptg)/(1/ptg)*100.);
 124       } else {
 125          Float_t phig=TMath::ATan2(gt[ngood].py,gt[ngood].px);
 126          Float_t phi =TMath::ATan2(py,px );
 127          hp->Fill((phi - phig)*1000.);
 128
 129          Float_t lamg=TMath::ATan2(gt[ngood].pz,ptg);
 130          Float_t lam =TMath::ATan2(pz ,pt );
 131          hl->Fill((lam - lamg)*1000.);
 132
 133          hpt->Fill((1/pt - 1/ptg)/(1/ptg)*100.);
 134       }
 135
 136       Float_t mom=track->GetP();
 137       Float_t dedx=track->GetdEdx();
 138       hep->Fill(mom,dedx,1.);
 139       if (TMath::Abs(gt[ngood].code)==211)
 140          if (mom>0.4 && mom<0.5) {
 141             he->Fill(dedx,1.);
 142          }
 143
 144    }
 145
 146    Stat_t ng=hgood->GetEntries(); cerr<<"Good tracks "<<ng<<endl;
 147    Stat_t nf=hfound->GetEntries();
 148    if (ng!=0)
 149       cerr<<"Integral efficiency is about "<<nf/ng*100.<<" %\n";
 150
 151    gStyle->SetOptStat(111110);
 152    gStyle->SetOptFit(1);
 153
 154    TCanvas *c1=new TCanvas("c1","",0,0,700,850);
 155
 156    TPad *p1=new TPad("p1","",0,0.3,.5,.6); p1->Draw();
 157    p1->cd(); p1->SetFillColor(42); p1->SetFrameFillColor(10);
 158    hp->SetFillColor(4);  hp->SetXTitle("(mrad)"); hp->Fit("gaus"); c1->cd();
 159
 160    TPad *p2=new TPad("p2","",0.5,.3,1,.6); p2->Draw();
 161    p2->cd(); p2->SetFillColor(42); p2->SetFrameFillColor(10);
 162    hl->SetXTitle("(mrad)"); hl->Fit("gaus"); c1->cd();
 163
 164    TPad *p3=new TPad("p3","",0,0,0.5,0.3); p3->Draw();
 165    p3->cd(); p3->SetFillColor(42); p3->SetFrameFillColor(10);
 166    hpt->SetXTitle("(%)"); hpt->Fit("gaus"); c1->cd();
 167
 168    TPad *p4=new TPad("p4","",0.5,0,1,0.3); p4->Draw();
 169    p4->cd(); p4->SetFillColor(42); p4->SetFrameFillColor(10);
 170    hmpt->SetXTitle("(%)"); hmpt->Fit("gaus"); c1->cd();
 171
 172    TPad *p5=new TPad("p5","",0,0.6,1,1); p5->Draw(); p5->cd();
 173    p5->SetFillColor(41); p5->SetFrameFillColor(10);
 174    hfound->Sumw2(); hgood->Sumw2(); hfake->Sumw2();
 175    hg->Divide(hfound,hgood,1,1.,"b");
 176    hf->Divide(hfake,hgood,1,1.,"b");
 177    hg->SetMaximum(1.4);
 178    hg->SetYTitle("Tracking efficiency");
 179    hg->SetXTitle("Pt (GeV/c)");
 180    hg->Draw();
 181
 182    TLine *line1 = new TLine(0,1.0,7,1.0); line1->SetLineStyle(4);
 183    line1->Draw("same");
 184    TLine *line2 = new TLine(0,0.9,7,0.9); line2->SetLineStyle(4);
 185    line2->Draw("same");
 186
 187    hf->SetFillColor(1);
 188    hf->SetFillStyle(3013);
 189    hf->SetLineColor(2);
 190    hf->SetLineWidth(2);
 191    hf->Draw("histsame");
 192    TText *text = new TText(0.461176,0.248448,"Fake tracks");
 193    text->SetTextSize(0.05);
 194    text->Draw();
 195    text = new TText(0.453919,1.11408,"Good tracks");
 196    text->SetTextSize(0.05);
 197    text->Draw();
 198
 199
 200
 201    TCanvas *c2=new TCanvas("c2","",320,32,530,590);
 202
 203    TPad *p6=new TPad("p6","",0.,0.,1.,.5); p6->Draw();
 204    p6->cd(); p6->SetFillColor(42); p6->SetFrameFillColor(10);
 205    he->SetFillColor(2); he->SetFillStyle(3005);
 206    he->SetXTitle("Arbitrary Units");
 207    he->Fit("gaus"); c2->cd();
 208
 209    TPad *p7=new TPad("p7","",0.,0.5,1.,1.); p7->Draw();
 210    p7->cd(); p7->SetFillColor(42); p7->SetFrameFillColor(10);
 211    hep->SetXTitle("p (Gev/c)"); hep->SetYTitle("dE/dX (Arb. Units)");
 212    hep->Draw(); c1->cd();
 213
 214    return 0;
 215 }
 216
 217
 218 Int_t good_tracks(GoodTrack *gt, Int_t max) {
 219    Int_t nt=0;
 220
 221    TFile *file=TFile::Open("rfio:galice.root");
 222    if (!file->IsOpen()) {cerr<<"Can't open galice.root !\n"; exit(4);}
 223
 224    if (!(gAlice=(AliRun*)file->Get("gAlice"))) {
 225      cerr<<"gAlice have not been found on galice.root !\n";
 226      exit(5);
 227    }
 228
 229    gAlice->GetEvent(0);
 230
 231    AliTPC *TPC=(AliTPC*)gAlice->GetDetector("TPC");
 232    Int_t ver = TPC->IsVersion();
 233    cerr<<"TPC version "<<ver<<" has been found !\n";
 234
 235    AliTPCParam *digp=(AliTPCParam*)file->Get("75x40_100x60");
 236    if (!digp) { cerr<<"TPC parameters have not been found !\n"; exit(6); }
 237    TPC->SetParam(digp);
 238
 239    Int_t nrow_up=digp->GetNRowUp();
 240    Int_t nrows=digp->GetNRowLow()+nrow_up;
 241    Int_t zero=digp->GetZeroSup();
 242    Int_t gap=Int_t(0.125*nrows);
 243    Int_t good_number=Int_t(0.4*nrows);
 244
 245    TClonesArray *particles=gAlice->Particles();
 246    Int_t np=particles->GetEntriesFast();
 247    Int_t *good=new Int_t[np];
 248    for (Int_t ii=0; ii<np; ii++) good[ii]=0;
 249
 250    switch (ver) {
 251    case 1:
 252      {
 253       TFile *cf=TFile::Open("AliTPCclusters.root");
 254       if (!cf->IsOpen()){cerr<<"Can't open AliTPCclusters.root !\n";exit(5);}
 255       AliTPCClustersArray *ca=new AliTPCClustersArray;
 256       ca->Setup(digp);
 257       ca->SetClusterType("AliTPCcluster");
 258       ca->ConnectTree("Segment Tree");
 259       Int_t nrows=Int_t(ca->GetTree()->GetEntries());
 260       for (Int_t n=0; n<nrows; n++) {
 261           AliSegmentID *s=ca->LoadEntry(n);
 262           Int_t sec,row;
 263           digp->AdjustSectorRow(s->GetID(),sec,row);
 264           AliTPCClustersRow &clrow = *ca->GetRow(sec,row);
 265           Int_t ncl=clrow.GetArray()->GetEntriesFast();
 266           while (ncl--) {
 267               AliTPCcluster *c=(AliTPCcluster*)clrow[ncl];
 268               Int_t lab=c->GetLabel(0);
 269               if (lab<0) continue; //noise cluster
 270               lab=TMath::Abs(lab);
 271               if (sec>=digp->GetNInnerSector())
 272               if (row==nrow_up-1    ) good[lab]|=0x1000;
 273               if (sec>=digp->GetNInnerSector())
 274               if (row==nrow_up-1-gap) good[lab]|=0x800;
 275               good[lab]++;
 276           }
 277           ca->ClearRow(sec,row);
 278       }
 279       cf->Close();
 280      }
 281       break;
 282    case 2:
 283       TTree *TD=(TTree*)gDirectory->Get("TreeD_75x40_100x60");
 284       AliSimDigits da, *digits=&da;
 285       TD->GetBranch("Segment")->SetAddress(&digits);
 286       Int_t *count = new Int_t[np];
 287       Int_t i;
 288       for (i=0; i<np; i++) count[i]=0;
 289       Int_t sectors_by_rows=(Int_t)TD->GetEntries();
 290       for (i=0; i<sectors_by_rows; i++) {
 291           if (!TD->GetEvent(i)) continue;
 292           Int_t sec,row;
 293           digp->AdjustSectorRow(digits->GetID(),sec,row);
 294           cerr<<sec<<' '<<row<<"                                     \r";
 295           digits->First();
 296           while (digits->Next()) {
 297               Int_t it=digits->CurrentRow(), ip=digits->CurrentColumn();
 298               Short_t dig = digits->GetDigit(it,ip);
 299               Int_t idx0=digits->GetTrackID(it,ip,0);
 300               Int_t idx1=digits->GetTrackID(it,ip,1);
 301               Int_t idx2=digits->GetTrackID(it,ip,2);
 302               if (idx0>=0 && dig>=zero) count[idx0]+=1;
 303               if (idx1>=0 && dig>=zero) count[idx1]+=1;
 304               if (idx2>=0 && dig>=zero) count[idx2]+=1;
 305           }
 306           for (Int_t j=0; j<np; j++) {
 307               if (count[j]>1) {
 308                  if (sec>=digp->GetNInnerSector())
 309                  if (row==nrow_up-1    ) good[j]|=0x1000;
 310                  if (sec>=digp->GetNInnerSector())
 311                  if (row==nrow_up-1-gap) good[j]|=0x800;
 312                  good[j]++;
 313               }
 314               count[j]=0;
 315           }
 316       }
 317       delete[] count;
 318       break;
 319    default:
 320       cerr<<"Invalid TPC version !\n";
 321       file->Close();
 322       exit(7);
 323    }
 324
 325    TTree *TH=gAlice->TreeH();
 326    TClonesArray *hits=TPC->Hits();
 327    Int_t npart=TH->GetEntries();
 328
 329    while (npart--) {
 330       TPC->ResetHits();
 331       TH->GetEvent(npart);
 332       Int_t nhits=hits->GetEntriesFast();
 333       if (nhits==0) continue;
 334       AliTPChit *hit;
 335       Int_t j;
 336       for (j=0; j<nhits-1; j++) {
 337          hit=(AliTPChit*)hits->UncheckedAt(j);
 338          if (hit->fQ==0.) break;
 339       }
 340       if (j==nhits-1) continue;
 341       AliTPChit *hit1=(AliTPChit*)hits->UncheckedAt(j+1);
 342       if (hit1->fQ != 0.) continue;
 343       Int_t i=hit->Track();
 344       TParticle *p = (TParticle*)particles->UncheckedAt(i);
 345       if (p->GetFirstMother()>=0) continue;  //secondary particle
 346       if (good[i] < 0x1000+0x800+2+good_number) continue;
 347       if (p->Pt()<0.100) continue;
 348       if (TMath::Abs(p->Pz()/p->Pt())>0.999) continue;
 349
 350       gt[nt].lab=i;
 351       gt[nt].code=p->GetPdgCode();
 352 //**** px py pz - in global coordinate system, x y z - in local !
 353       gt[nt].px=hit->X(); gt[nt].py=hit->Y(); gt[nt].pz=hit->Z();
 354       Float_t cs,sn; digp->AdjustCosSin(hit1->fSector,cs,sn);
 355       gt[nt].x = hit1->X()*cs + hit1->Y()*sn;
 356       gt[nt].y =-hit1->X()*sn + hit1->Y()*cs;
 357       gt[nt].z = hit1->Z();
 358       nt++;
 359
 360       cerr<<i<<"                \r";
 361       if (nt==max) {cerr<<"Too many good tracks !\n"; break;}
 362    }
 363    delete[] good;
 364
 365    delete gAlice; gAlice=0;
 366
 367    file->Close();
 368    return nt;
 369 }
 370
 371
 372