added tcsh UI

[u/mrichter/AliRoot.git] / RICH / RICHoccupancy.C

void RICHoccupancy (Int_t evNumber1=0,Int_t evNumber2=0) 
{
/////////////////////////////////////////////////////////////////////////
//   This macro is a small example of a ROOT macro
//   illustrating how to read the output of GALICE
//   and do some analysis.
//   
/////////////////////////////////////////////////////////////////////////

  
  // Dynamically link some shared libs
 
    if (gClassTable->GetID("AliRun") < 0) {
      gROOT->LoadMacro("loadlibs.C");
      loadlibs();
    }
    else {
      //delete gAlice;
      gAlice = 0;
    }
    
    gAlice=0;
    
    // Connect the Root Galice file containing Geometry, Kine and Hits
    
    TFile *file = (TFile*)gROOT->GetListOfFiles()->FindObject("galice.root");
    if (!file) file = new TFile("galice.root","UPDATE");
    
    // Get AliRun object from file or create it if not on file
    
    if (!gAlice) {
      gAlice = (AliRun*)file->Get("gAlice");
      if (gAlice) printf("AliRun object found on file\n");
      if (!gAlice) gAlice = new AliRun("gAlice","Alice test program");
    }
    else {
      delete gAlice;
      gAlice = (AliRun*)file->Get("gAlice");
      if (gAlice) printf("AliRun object found on file\n");
      if (!gAlice) gAlice = new AliRun("gAlice","Alice test program");
    }
    

//   Start loop over events 

 Float_t occ[7]; 
 Float_t sum=0;
 Float_t mean=0;
 
 for (int nev=0; nev<= evNumber2; nev++) {
   Int_t nparticles = gAlice->GetEvent(nev);
   
   
   printf ("Number of Events   : %d\n",nev);
   printf ("Number of particles: %d\n\n",nparticles);
   //if (nev < evNumber1) continue;
   //if (nparticles <= 0) return;
   
   // Get pointers to RICH detector and Hits containers
  
   AliRICH *RICH  =(AliRICH*) gAlice->GetModule("RICH");
   Int_t nent=(Int_t)gAlice->TreeD()->GetEntries();
   gAlice->TreeD()->GetEvent(0);

   for (Int_t ich=0;ich<7;ich++)
     {
       TClonesArray *Digits = RICH->DigitsAddress(ich);    //  Raw clusters branch
       //printf ("Digits:%p",Digits);
       Int_t ndigits = Digits->GetEntriesFast();
       occ[ich] = Float_t(ndigits)/(160*144);
       sum += Float_t(ndigits)/(160*144);
       printf ("Occupancy in chamber %d: %f, generated by %d digits\n",ich,occ[ich],ndigits);
     }
   mean = sum/7;
   printf("\nMean occupancy: %f\n",mean);
 }
}