TFile *f = new TFile("YourFile.root","RECREATE");
gDirectory->pwd();
f->mkdir("mystuff");
f->cd("mystuff");
gDirectory->pwd();
f->GetCompressionFactor()
.ls
gROOT-cd();
TH1F*h=new TH1F("h","Interactive;X;Entries",100,-5,5);
h->FillRandom("gaus",10000);
f->cd();
h->Write();
gDirectory->ls("-d");
f->GetCompressionFactor()
gDirectory->ls("-m");
h->Draw();
c1->Write();
TH1F *hc=(TH1F*)gDirectory→Get("h");
hc->Draw();
vector <int> p{2,5,7};
gDirectory->WriteObject(&p,"p_1");
vector <int> *l;
gDirectory->GetObject("p_1",l);
cout << l->size() <<endl;
TFile *x = TFile::Open("https://www.physi.uni-heidelberg.de/~marks/analysis.root");
gDirectory->ls();
TH1F *tt =(TH1F*)gDirectory→Get("T");
tt->Draw();
gROOT-cd();
gDirectory->ls();
TF1 *d1 = new TF1 ("d1","sin(x)",0,6);
d1->Write();
f->Close();