Hi,
I need to manage a TTree object which contains a unique branch, which is
in the form of a class that does not inherit from TObject.
Is is created this way:
----------------------------------
// Tree declaration
t_data = new TTree("t_data","data tree");
// autosave when 100 MB written
t_data->SetAutoSave(100000000);
// Data objects for the tree
branchData = new branch();
branchNoisyPixels = new branchCoordinates();
t_branchData = t_data->Branch ("branchData", branchData,
"parameter/D:eventNumber/D:plane/D:chip/D:multiplicity/D:column/D:row/D:sigma2C/D:sigma2R/D:clusterSizeC/D:clusterSizeR/D",100000000);
---------------------
Now, when I open the file which contains it and I try to draw a member
via clicking on its name in a TBrowser, I get no plots.
Moreover, if I try to use the TTree->Draw() method from the ROOT prompt,
I get no plots.
I made also a trial to use TEventList:
----
TCut cut_ev = Form("eventNumber < %d", evMax);
TCut cut_p1 = Form("plane == %d", plane1);
TCut cut_p2 = Form("plane == %d", plane2);
t_branch->Draw(">>list1", cut_ev && cut_p1);
TEventList *list1 = (TEventList*)gDirectory->Get("list1");
t_branch->Draw(">>list2", cut_ev && cut_p2);
TEventList *list2 = (TEventList*)gDirectory->Get("list2");
Int_t N1 = list1->GetN();
Int_t N2 = list2->GetN();
cout << "Entries in the given planes: " << N1 << " , " << N2 << endl;
----
and in this case I get an error message which tells me that the object
"list1" and "list2" are 0x0 pointers.
Is there some techique to deal with these data?
Thanks,
Alberto
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