1 void RICHoccupancy (Int_t evNumber1=0,Int_t evNumber2=0)
3 /////////////////////////////////////////////////////////////////////////
4 // This macro is a small example of a ROOT macro
5 // illustrating how to read the output of GALICE
6 // and do some analysis.
8 /////////////////////////////////////////////////////////////////////////
11 // Dynamically link some shared libs
13 if (gClassTable->GetID("AliRun") < 0) {
14 gROOT->LoadMacro("loadlibs.C");
24 // Connect the Root Galice file containing Geometry, Kine and Hits
26 TFile *file = (TFile*)gROOT->GetListOfFiles()->FindObject("galice.root");
27 if (!file) file = new TFile("galice.root","UPDATE");
29 // Get AliRun object from file or create it if not on file
32 gAlice = (AliRun*)file->Get("gAlice");
33 if (gAlice) printf("AliRun object found on file\n");
34 if (!gAlice) gAlice = new AliRun("gAlice","Alice test program");
38 gAlice = (AliRun*)file->Get("gAlice");
39 if (gAlice) printf("AliRun object found on file\n");
40 if (!gAlice) gAlice = new AliRun("gAlice","Alice test program");
44 // Start loop over events
50 for (int nev=0; nev<= evNumber2; nev++) {
51 Int_t nparticles = gAlice->GetEvent(nev);
54 printf ("Number of Events : %d\n",nev);
55 printf ("Number of particles: %d\n\n",nparticles);
56 //if (nev < evNumber1) continue;
57 //if (nparticles <= 0) return;
59 // Get pointers to RICH detector and Hits containers
61 AliRICH *RICH =(AliRICH*) gAlice->GetModule("RICH");
62 Int_t nent=(Int_t)gAlice->TreeD()->GetEntries();
63 gAlice->TreeD()->GetEvent(0);
65 for (Int_t ich=0;ich<7;ich++)
67 TClonesArray *Digits = RICH->DigitsAddress(ich); // Raw clusters branch
68 //printf ("Digits:%p",Digits);
69 Int_t ndigits = Digits->GetEntriesFast();
70 occ[ich] = Float_t(ndigits)/(160*144);
71 sum += Float_t(ndigits)/(160*144);
72 printf ("Occupancy in chamber %d: %f, generated by %d digits\n",ich,occ[ich],ndigits);
75 printf("\nMean occupancy: %f\n",mean);