Hi Stefan, In your ProcessCut function, do: b_myparticle_->GetEntry(0); b_myparticle_momentum->GetEntry(0); cout << myparticle_momentum[0] << endl; In case you have a TClonesArray, you must read first the number of elements in the array. This number is obtained by reading the branch with name myparticle_ Rene Brun Stefan Steinbeck wrote: > > Dear Root-ers, > > for the analysis of a tree (containing some TClonesArray's) I would like > to use the class, which is created by the TTree::MakeSelector method. > It is somehow not possible for me to access members of the TClonesArray, > which the GetEntry method. > For example assume a tree 'mytree' which a TClonesArray 'myparticle' and > a member 'momentum'. To access the first entry of 'momentum', I'll tried > to following: > > b_myparticle_momentum->GetEntry(1); > cout << myparticle_momentum[0] << endl; > > Can you tell me the correct way? > > Thanks a lot for your help, > Stefan
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