ROOT数据中的TREE结构 步骤： 1.建立一个TFi1e TFile *hfile new TFile("AFile.root","RECREATE"): 2.建立一个Ttree TTree *tree=new TTree("myTree","A ROOT tree"); TTree aliTree("aliTree","/aliroot"): 3.把TBranch加到Ttree Event *event=new Event(); myTree->Branch("EventBranch","Event",&event): 4.填入tree myTree->FillO); Tree H1F,H2F,Ntuple 5.写到一个文件上 等等。 hfile->Write(); 99 ROOT数据中的TREE结构 步骤: 1. 建立一个 TFile 2. 建立一个 Ttree 3. 把 TBranch 加到 Ttree 4. 填入 tree 5. 写到一个文件上 TFile *hfile = new TFile("AFile.root","RECREATE"); TTree *tree = new TTree("myTree","A ROOT tree"); TTree aliTree("aliTree", "/aliroot")； Event *event = new Event(); myTree->Branch("EventBranch","Event",&event); myTree->Fill()； hfile->Write(); Tree = H1F, H2F, Ntuple 等等