Hi rooters, thank you at all for you answers to my question... but i think that i was not very clear... First problem: This command lines are in a macro, that (in execution) ask me the value for zmincut... then i do not know a priori his value!!! For example: TFile* file = new TFile("strip4_z2.root"); TNtuple* ntuple=(TNtuple*)file->Get("h8;1"); (...) cout<<"Give me the zmincut, please "; cin>>zmincut; ntuple->Draw("Iadc1","Xpos>zmincut"); Second problem: +And an other problem... +When the command Draw (ntuple-Draw("Xpos"); or histogram->Draw();)is +inside a macro, the histogram is plotted only when the macro is closed. +And When the command Draw is inside a macro called by an other main +macro, the histogram is plotted only when the main macro is closed. But +how can i interact with the histogram (to draw a line where i want, for +example), if i do not see him? For example: ntuple->Draw("Zpos"); cout<<'\n'<<"Give me the zmincut, please "; cin>>zmincut; cout<<'\n'<<"Give me the zmaxcut, please "; cin>>zmaxcut; ntuple->Draw("Iadc1","Zpos>zmincut && Zpos<zmaxcut"); If i understand, in cuts definition, the cut values can be numeric only!!! Thank you ************************************************************************* * University of Bologna | | decaro@bo.infn.it * * Physics Department | +39 051 20 91103 | * *-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-* * University of Salerno | | * * Physics Sciences Department | +39 089 96 5359 | * * (INFN of Napoli) | | * *-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-* * CERN - EP division | | decaro@mail.cern.ch * * (Bld.29 R019) | +41 22 76 77767 | * *************************************************************************
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