Maurizio: you don't want to name your histograms the way you did - `Q2_1.605', for example, is being interpreted as a reference to a data member `605' of an object `Q2_1'. This is not allowed by the C++ syntax. Try changing the name of your histogram to `Q2_1_605' - this should help. -best, pasha Maurizio Ungaro writes: > Maybe I'm dummy, > I''ve created a out.root file with 50 histograms in it. > Name like : Q2_1.605 etc etc. > If I try to read them with the browes I can do it, > but from the command line I cannot: > I do > > TFile a("out.root"); > a.ls(); > > and I get the right list. > > then if I try > > Q2_1.955->Draw(); > > I get : > > root [4] Q2_1.955->Draw(); > Error: No symbol Q2_1.955->Draw() in current scope > FILE:/tmp/fileCarAcr_cint LINE:1 > Possible candidates are... > filename line:size busy function type and name > *** Interpreter error recovered *** > > What's going on? > > Thanks a lot, > > Maurizio Ungaro
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