Bug Fix (Yves)

diff --git a/TPC/AliTPCQADataMakerSim.cxx b/TPC/AliTPCQADataMakerSim.cxx
index b6127b33728371b3709d8136f3da02ace093efaf..a9b1eebf0638f77fe4fd2bbba36b19980786dccd 100644 (file)
--- a/TPC/AliTPCQADataMakerSim.cxx
+++ b/TPC/AliTPCQADataMakerSim.cxx
@@ -170,74 +170,73 @@ void AliTPCQADataMakerSim::MakeHits(TTree * hitTree)
   const Int_t nTracks = hitTree->GetEntries();
   TBranch* branch = hitTree->GetBranch("TPC2");  
   AliTPCv2* tpc = (AliTPCv2*)gAlice->GetDetector("TPC");
-
+  
   //
   // loop over tracks
   //
   for(Int_t n = 0; n < nTracks; n++){
-    
     Int_t nHits = 0;
     branch->GetEntry(n);
-    AliTPChit* tpcHit = (AliTPChit*)tpc->FirstHit(-1);  
     
-    Float_t dist  = 0.;
-    Int_t   nprim = 0;
-    Float_t xold  = tpcHit->X();
-    Float_t yold  = tpcHit->Y();
-    Float_t zold  = tpcHit->Z(); 
-    Float_t radiusOld = TMath::Sqrt(xold*xold + yold*yold);
-    Float_t q     = 0.;
+    AliTPChit* tpcHit = (AliTPChit*)tpc->FirstHit(-1);  
     
-    while(tpcHit) {
-      
-      Float_t x = tpcHit->X();
-      Float_t y = tpcHit->Y();
-      Float_t z = tpcHit->Z(); 
-      Float_t radius = TMath::Sqrt(x*x + y*y);
-      
-      if(radius>50) { // Skip hits at interaction point
-       
-       nHits++;
-       
-       Int_t trackNo = tpcHit->GetTrack();
+    if (tpcHit) {
+      Float_t dist  = 0.;
+      Int_t   nprim = 0;
+      Float_t xold  = tpcHit->X();
+      Float_t yold  = tpcHit->Y();
+      Float_t zold  = tpcHit->Z(); 
+      Float_t radiusOld = TMath::Sqrt(xold*xold + yold*yold);
+      Float_t q     = 0.;
+      while(tpcHit) {
+       Float_t x = tpcHit->X();
+       Float_t y = tpcHit->Y();
+       Float_t z = tpcHit->Z(); 
+       Float_t radius = TMath::Sqrt(x*x + y*y);
        
-       if(trackNo==n) { // primary track
+       if(radius>50) { // Skip hits at interaction point
          
-         fHistHitsElectrons->Fill(tpcHit->fQ);
-         fHistHitsRadius->Fill(radius);
+         nHits++;
          
-         // find the new distance
-         dist += TMath::Sqrt((x-xold)*(x-xold) + (y-yold)*(y-yold) + 
-                             (z-zold)*(z-zold));
-         if(dist<1.){  
-           // add data to this 1 cm step
-           nprim++;  
-           q += tpcHit->fQ;
+         Int_t trackNo = tpcHit->GetTrack();
+         
+         if(trackNo==n) { // primary track
            
-         } else{
-           // Fill the histograms normalized to per cm 
+           fHistHitsElectrons->Fill(tpcHit->fQ);
+           fHistHitsRadius->Fill(radius);
            
-           if(nprim==1)
-             cout << radius << ", " << radiusOld << ", " << dist << endl; 
-
-           fHistHitsPrimPerCm->Fill((Float_t)nprim);
-           fHistHitsElectronsPerCm->Fill(q);
-
-           dist  = 0;
-           q     = 0;
-           nprim = 0;
+           // find the new distance
+           dist += TMath::Sqrt((x-xold)*(x-xold) + (y-yold)*(y-yold) + 
+                               (z-zold)*(z-zold));
+           if(dist<1.){  
+             // add data to this 1 cm step
+             nprim++;  
+             q += tpcHit->fQ;
+             
+           } else{
+             // Fill the histograms normalized to per cm 
+             
+             if(nprim==1)
+               cout << radius << ", " << radiusOld << ", " << dist << endl; 
+             
+             fHistHitsPrimPerCm->Fill((Float_t)nprim);
+             fHistHitsElectronsPerCm->Fill(q);
+             
+             dist  = 0;
+             q     = 0;
+             nprim = 0;
+           }
          }
        }
+       
+       radiusOld = radius;
+       xold = x;
+       yold = y;
+       zold = z;
+       
+       tpcHit = (AliTPChit*) tpc->NextHit();
       }
-      
-      radiusOld = radius;
-      xold = x;
-      yold = y;
-      zold = z;
-      
-      tpcHit = (AliTPChit*) tpc->NextHit();
     }
-    
     fHistHitsNhits->Fill(nHits);
   }
 }