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// |
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// Example to loop over events, reading more than one file. |
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// |
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// Input parameters are: |
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// - dir: name of the directory where Level2 files are stored |
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// - list: name of a text file with the list of file names to be processed. |
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// If list="" all ROOT files inside the directory are processed (ROOT files that does not |
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// match Pamela Level2 structure are automatically discarded) |
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// - treelist: string containing the list of trees to be loaded (es: "-ORB-ND" or "-ALL+TRK+CAL+TOF"). |
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// Possible options are: |
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// +ALL +TRK +CAL +TRG +TOF +ND +AC +S4 +ORB |
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// -ALL -TRK -CAL -TRG -TOF -ND -AC -S4 -ORB |
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// - nmax: maximum number of events to be processed |
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// |
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// All selected trees in all the files are chained and made friends. |
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// The whole "blob" can be accessed as if it was a single tree. |
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// |
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void example3(TString dir,TString list="", TString treelist="+ALL", Int_t nmax=500000000){ |
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|
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// Create a timer object to benchmark this loop |
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TStopwatch timer; |
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timer.Start(); |
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TString wd=gSystem->WorkingDirectory(); |
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// |
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PamLevel2* event = new PamLevel2(); // << create pamela event |
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|
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// ========================================================= |
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// << First a TList of root files is created |
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// << (either from a specific list or from the whole input directory) |
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TList *l = event->GetListOfLevel2Files(dir,list); |
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// << Hence a TChain is created from the list. |
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// << All the trees required by the user are made friend. |
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TChain *T = event->GetPamTree(l,treelist); |
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// << In the following the TChain can be used similarly to a TTree. |
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// |
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// NB! It is still possible to read a single file and get a TTree, by means of the methods: |
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// TTree* LoadPamTrees(TFile *f); |
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// TTree* LoadPamTrees(TFile *f,TString treelist); |
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// ========================================================= |
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|
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Int_t nevent = T->GetEntries(); |
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|
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Int_t ntrk=0; |
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if(nevent < nmax)nmax=nevent; |
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cout << endl<<" Start loop over events "<<endl; |
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for (Int_t i=0; i<nmax;i++){ |
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// |
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T->GetEntry(i); |
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|
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if(event->GetNTracks() > 1)cout << " Ev "<<i << " multiple tracks: "<< event->GetNTracks() << endl; |
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|
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if(event->TrkLevel2::ntrk() >0){ |
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ntrk++; |
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}; |
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|
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for(Int_t it=0; it<event->GetNTracks(); it++){ |
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|
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PamTrack *track = event->GetTrack(it); |
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PamTrack *image = 0; |
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|
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if(track->HasImage())image = event->GetTrackImage(it); |
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|
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delete track; |
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if(image)delete image; |
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|
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}; |
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|
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}; // end loop over the events |
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cout << endl << endl << " Done "<< endl<<endl; |
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cout << ntrk <<" tracks over "<<nmax<<" events ("<< 100*ntrk/nmax<<"%)"<<endl; |
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|
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// Stop timer and print results |
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timer.Stop(); |
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Double_t rtime = timer.RealTime(); |
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Double_t ctime = timer.CpuTime(); |
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printf("RealTime=%f seconds, CpuTime=%f seconds\n",rtime,ctime); |
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|
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gSystem->ChangeDirectory(wd); |
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|
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}; |
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