Hi ROOTers, I am sorry if this question is very too trivial, but I don't know where mistake. The problem is that, when call the my function "delta_egamma" in my program ,root tell me : root [0] .L ana_dali_mc.C root [1] ana_dali_mc mio root [2] mio.Loop() Error: Illegal Assignment to an undeclared symbol TLorentzVectorx FILE:ana_dali_mc.C LINE:304 *** Interpreter error recovered *** My program is: #define ana_dali_mc_cxx #include "ana_dali_mc.h" void ana_dali_mc::Loop() { if (!TClassTable::GetDict("Physics")) { gSystem.Load("$ROOTSYS/lib/libPhysics.so"); } ... Double_t pluto; TLorentzVector p4datetasys_pim,p4datetasys_pip,p4datetasys_piz; TTree *tmc = new TTree("tmc","Tree for montecarlo"); for (Int_t jentry=0; jentry<nentries;jentry++) { ... pluto = delta_egamma(p4datetasys_pip,p4datetasys_pim); tmc ->Fill(); } } Double_t delta_egamma(TLorentzVector x,TLorentzVector y) { Double_t delta; TLorentzVector pippo; pippo = x; mimmie= y; ... delta = pippo.Mag2(); return delta; } Someone can tell me how can I do that ?(where is my mistake ? ) Regards Francesco.
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