Alexander Zvyagin wrote: > > IHEP, Protvino, Russia, 13-MAY-1998 > > Dear ROOT team, > > I want to draw TGraph where range of axe X is x_max/x_min=1e6. It seems that > graph axis has limitation x_max/x_min<1e3. Is it possible to overcome this > limitation? > > Example of Macro: > > void e2(void) > { > gROOT->Reset(); > > Float_t E_min=1e-3, E_max=1e3; > > const Int_t N_points_max = 1111; > Int_t N_points; > Float_t x[N_points_max],y[N_points_max],x_err[N_points_max], > y_err[N_points_max]; > > for( N_points=0; N_points<N_points_max; N_points++ ) > { > x [N_points] = E_min+(E_max-E_min)*(Float_t)(N_points) > /N_points_max; > x_err [N_points] = 0; > y [N_points] = 1; > y_err [N_points] = 0; > } > > TGraphErrors *graph = new TGraphErrors(N_points,x,y,x_err,y_err); > > c1 = new TCanvas("c1","Test",200,10,700,500); > > c1->SetLogx(1); > > graph->SetTitle("?????????????"); > graph->Draw("AP"); > > c1->Update(); > } Alexander, The automatic computation of the axis range for TGraphs could be improved. The current algorithm takes 3 decades by default in case of log axis. It is easy to upgrade the algorithm to at least do a better job in your case. An easy solution for the time being is to replace your statement graph->Draw("AP"); by c1->DrawFrame(1,0.9,1000,2.1); graph->Draw("P"); Rene Brun
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