Hello, The way to do it would be: gr->GetHistogram()->SetAxisRange(0, 360, "X"); gr->GetHistogram()->SetAxisRange(0, 200, "Y"); gr->GetXaxis()->SetNdivisions(-504); a negative number of divisions meaning that the divisions should not be optimize. But doing that I do not get exactly 360 as upper limit... That's weird ... I'll investigate. Olivier On Wed, 17 Mar 2004, Andreas Zoglauer wrote: > > Hello, > > This probably a really simple question, but I have not found anything > helpful in the documentation... > > > I have a graph whose x-axis ranges from 0° to 360°. > Thus a wanted to divide the x-axis in a way, that it shows the ticks 0, > 90, 180, 270 and 360. > > How do I do this? > I tried it with SetNdivisions but this only gives me the ticks at 100, > 200 and 300.. > > > Here is my example macro: > > void Ticks() > { > gROOT->Reset(); > TCanvas* c1 = new TCanvas("c1","Modulation"); > > int NPoints = 360; > TGraph* gr = new TGraph(NPoints); > > for (int i = 0; i < NPoints; ++i) { > double x = i*360.0/NPoints; > double y = 100 + 50*cos(2*x*TMath::Pi()/180); > gr->SetPoint(i, x, y); > } > > gr->Draw("AC"); > c1->Update(); > > gr->GetHistogram()->SetXTitle("Azimuthal scatter angle"); > gr->GetHistogram()->SetYTitle("Counts"); > gr->GetHistogram()->SetAxisRange(0, 360, "X"); > gr->GetHistogram()->SetAxisRange(0, 200, "Y"); > gr->GetHistogram()->SetNdivisions(504, "X"); > c1->Modified(); > } > > Thanks, > Andreas > > > > -- Org: CERN - European Laboratory for Particle Physics. Mail: 1211 Geneve 23 - Switzerland Mailbox: J25910 E-Mail: Olivier.Couet@cern.ch Phone: +41 22 7676522 WWW: http://cern.ch/Olivier.Couet/ Fax: +41 22 7677155
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