Hi Christian, you should call SetMaximum and SetMinimum mg->SetMaximum(400); mg->SetMinimum(0); In the CVS version, I have optimized the computation of the minimum such that the call to SetMinimum is not necessary. Rene Brun Christian Hansen wrote: > > Dear Rooters, > > how can I controle the Y-axis in a MultiGraph? > I've tried with both > GetYaxis()->SetLimits > and with > SetMaximum > (see comment out line in the attached simplified example) > but nothing works. > > Thanks > /Chris > > -------------------------------------------------------------------------------- > #include "iostream" > #include "TH1.h" > #include "TF1.h" > #include "TCanvas.h" > > void test() { > gROOT->Reset(); > > const Int_t n = 7; > Float_t signal[n] = {2022.89, 346.704, 322.063, 192.962, 59.6308, 33.8207, 29.2591}; > Float_t bkg1[n] = {45620000, 54753.1, 50866.3, 6359.43, 1154.19, 679.738, 510.944}; > Float_t x[n] = {0, 1, 2, 3, 4, 5, 6}; > > TCanvas *c1 = new TCanvas("test","test",10,10,700,500); > TGraph* gr1 = new TGraph(n,x,signal); > gr1->SetMarkerStyle(3); > //gr1->GetYaxis()->SetLimits(0,400.); > //gr1->SetMaximum(400.); > TGraph* gr2 = new TGraph(n,x,bkg1); > gr2->SetMarkerStyle(21); > //gr2->GetYaxis()->SetLimits(0,400.); > //gr2->SetMaximum(400.); > > TMultiGraph* mg = new TMultiGraph(); > mg->Add(gr1,"lp"); > mg->Add(gr2,"lp"); > //mg->SetMaximum(400.); > mg->Draw("a"); > > }
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