Hi all, I would like add 2 or more TLorentzVector for then take the .M(). After I open my root file with TBrowser in which there are the TLorentzVector I do at command line: root [1] .L $ROOTSYS/lib/libPhysics.so root [2] res->Draw("(p4_pi1_eta_rec_fit + p4_pi2_eta_rec_fit).M()") (WHERE p4_pi1_eta_rec_fit. and p4_pi2_eta_rec_fit. are 2 my TLorentzVector) but I have the following error: *ERROR 30 : Bad numerical expression :"(p4_pi1_eta_rec_fit+p4_pi2_eta_rec_fit).M()" root [3] There is anyone that can help me? Thanks in advance. Francesco.
This archive was generated by hypermail 2b29 : Sun Jan 02 2005 - 05:50:08 MET