Hello ROOTs,
i tried to generate TEventLists using TTree:Draw() on an array of TTrees
(Trees[])
for (int ds = min; ds < max; ds++){
//Reseting Tree-EventList
Trees[ds]->SetEventList(0);
// Draw into list
cout << ((TTree*)Trees[ds])->Draw(">> list",Sel.GetTitle());
// Get the list
TEventList * list = (TEventList*)gDirectory->Get("list");
cout << "\t " << list->GetN() << " Events\n";
}
As this would only work if i did a TTree::Draw() in a histogram before, i
tried to circumvent this by accesing the TTreePlayer
// Print the events in a list
TEventList * list = new TEventList("list",Sel.GetTitle());
list->SetDirectory(0);
//Lets play with this tree
TTreePlayer * tPlay = ((TTree*)Trees[ds])->GetPlayer();
//Assign selection to tree
tPlay->CompileVariables("",Sel.GetTitle());
//Now run the TreePlayer loop (5 means assign to elist)
tPlay->EntryLoop(5,list);
Unfortunatley this would not work either. If i specify a variable in
addition to the selection in TTreePlayer::CompileVariables I would just
get the last event of the tree in the list, otherwise i got an empty list
as before.
Now my question is if there is a way to generate a TEventList from a Tree
w/o drawing something from the Tree before ?
Thanks
Sebastian
---------------------------------------------------
\|/ Sebastian Böser
/ ~~
@--OO Rinkartstr. 3
\ ? 12437 Berlin
\ v Tel: 030 / 532 19 008
|| sboeser@ph.tum.de
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