Hi All, First of all excuse me,I have done a wrong example in previous mail. But I would like known if the Angle function can have a problem because it give me a problem (wrong results) in my compiled program ? ... for(Int_t k=0; k<6; k++){ angolo[k] =( ((TLorentzVector*)(p4_ph_rec_fitA->At(combi_ord[0][k])))-> Angle( ((TLorentzVector*)(p4_ph_recA->At(combi_ord[0][k])))->Vect() ) )*57.30 } p4_ph_recA and p4_ph_rec_fitA are 2 TClonesArray of TLorentzVector. Thanks Francesco.
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