Hi Mark, 2-D histograms with axis coordinates increasing from right to left are not supported. However, you can visualize a 2-D histogram with the option "surf" by setting the viewing angles such that, eg the x axis coordinates will go from right to left as shown in the small example below. Rene Brun { TH2F *hpxpy = new TH2F("hpxpy","py vs px",40,-4,4,40,-4,4); Float_t px, py; TRandom r; for (Int_t i = 0; i < 25000; i++) { r.Rannor(px,py); hpxpy->Fill(px,py); } TCanvas *c1 = new TCanvas("c1"); c1->SetTheta(90.001); c1->SetPhi(90.001); hpxpy->Draw("surf2"); } Mark Polsen wrote: > > Hello all, > > Is there a way to reverse the lower and upper ranges for a TH2D? I'm > using 2D histograms to display astrophysical sources in galactic > coordinates. Currently, I can only display the longitude coordinates > increasing from left to right. I'd like to display the longitude > coordinates increasing from right to left. > > Thanks, > Mark
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