Hi Dirk, TLorentzVector is in libPhysics.so, not loaded by default. You should do: gSystem->Load("libPhysics"); PS: You could have found this information in the roottalk digest. Take a look e.g. at http://root.cern.ch/cgi-bin/print_hit_bold.pl/root/roottalk/roottalk00/1842.html En/Na Dirk Dünkelmann ha escrit: > it seems to me, that RooT does not know the Physics Vector Classes by > default. > root [0] .class TLorentzVector > Error: class,struct,union or type TLorentzVector not defined FILE: > LINE:0 > *** Interpreter error recovered *** > root [1] > How can I define it? > Thanks, > Dirk cheers, -- David D'ENTERRIA - Marie-Curie PostDoc Fellow - TAPS·PHENIX·ALICE Groupe Photons SUBATECH tel: +33 2 51 85 85 60 4, A. Kastler BP 20722 · 44307 Nantes fax: +33 2 51 85 84 24 http://www-subatech.in2p3.fr/~photons mailto:enterria@in2p3.fr ---------------------------------------------------------------------
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