#includeIn this example, we create a new ROOT file called "myFile.root", and inside it, we create a new directory called "myDirectory" using TFile::mkdir. We then move into the new directory using TDirectory::cd and create a new histogram called "histogram". Finally, we fill the histogram with the value 50 and close the ROOT file with TFile::Close. Overall, TFile::mkdir is a useful function for organizing data inside ROOT files, and it's part of the ROOT package library of C++.void example() { // Open a ROOT file TFile* file = new TFile("myFile.root", "RECREATE"); // Create a new directory called "myDirectory" TDirectory* directory = file->mkdir("myDirectory"); // Do something inside the new directory directory->cd(); TH1F* histogram = new TH1F("histogram", "Histogram Title", 100, 0, 100); histogram->Fill(50); // Close the ROOT file file->Close(); }