TFile* file = new TFile("myfile.root", "READ"); TTree* tree = (TTree*)file->Get("mytree"); // Get the 5th entry from the tree Int_t entry = tree->GetEntry(5);
TFile* file = new TFile("myfile.root", "READ"); TTree* tree = (TTree*)file->Get("mytree"); // Loop over all entries in the tree for (Int_t entry=0; entryIn this example, we again load the ROOT file and retrieve the TTree. We then use a for loop to loop over all entries in the tree. Inside the loop, we call the GetEntry() function to load the data from each entry into memory so we can use it for analysis. Overall, the GetEntry() function is a key tool for accessing data in a TTree, and it is used extensively in the ROOT package for data analysis and management.GetEntries(); entry++){ tree->GetEntry(entry); // Do something with the data in this entry }