Hi Rene, Thanks for your help, but still don't work, now root - after the command .x prova.C - tell me: Limitation: Variable argument is not supported for this platform FILE:risol.C LINE:38 *** Break *** floating point exception Root > Can you help me again ? I use root 3.02/07 on sun SPARC 5.6 Ciao, Francesco. On Wed, 11 Dec 2002, Rene Brun wrote: > Hi, > > What you do is illegal C++. TTree::Draw expects a valid string. > You can do: > > res->Draw(Form("diff_E_p4[%d]",i)); > > Rene Brun > > On Wed, 11 Dec 2002, Perfetto Francesco wrote: > > > Hi all, > > > > I have a tree with any variables; any of these variables are array, I > > would like to know if there is an easy mode for draw it (for example in a > > cycle for). > > I make this but it don't work > > > > TFile *f = new TFile("analisi_mc_prova.root","r"); > > > > for(Int_t i=0;i<7;i++) > > res->Draw("diff_E_p4[i]"); <<---diff_E_p4 is an array of double > > > > when run .x prova.C root tell me: > > ERROR 26 : > > Unknown name : "i" > > > > Ciao, Francesco. > > > >
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