Hi Annalisa, To answer to your first question, you can use the sprintf function (C style) or the more elaborated ostrstream object (C++ style). In a simple case like yours, sprintf seems more appropriate to me. So you type: TFile* file = new TFile("strip4_z2.root"); TNtuple* ntuple=(TNtuple*)file->Get("h8;1"); (....) ; // whatever goes there float zmincut, zmaxcut; cout << "Give me the zmincut, please " << flush; // nice way cin >> zmincut; cout<< "\nGive me the zmaxcut, right now " << flush; // rude way cin >> zmaxcut; char szCut[80]; // string holder for the cut sprintf(szCut,"Zpos > %f && Zpos < %f", zmincut, zmaxcut); // creates the string for the cut ntuple->Draw("Iadc1", szCut); Hope that helps Matthieu Guillo University of South Carolina Thomas Jefferson National Laboratory Office 71 trailer 16 Phone: 757-269-5551 On Wed, 4 Apr 2001, Annalisa De Caro wrote: > 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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