Horst Goeringer wrote: > > Hi, > > can I fill independent trees in one analysis and > write them to different files? > Must I use TBranch::SetFile() ? I cannot find a > TTree::SetFile() or similar! > Hi Horst, When you create a TTree, this object is assigned by default to the current directory/file. You can fill a TTree without changing the current directory. At the end of the process, you must save the TTree header in the file where it was initially created. Example with 2 TTrees: TFile f1("f1.root","recreate"); TTree tree1("tree1",..); TFile f2("f2.root","recreate"); TTree tree2("tree2"..) ... //loop on events f1.Fill(); f2.Fill(); ... //end of process f1.cd(); tree1.Write(); f1.Close(); f2.cd(); tree2.Write(); f2.Close(); Assuming one TTree, you can write branches of this Tree to different files via TBranch::SetFile Rene Brun
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