Hi Hiroki, This option does not exists by default, but is not too complicated to emulate. Here is an example. Rene Brun void bars() { // example showing how to plot a 1-d histograms horizontal Int_t nbins = 20; Float_t xmin = -4; Float_t xmax = 4; TH1F *h = new TH1F("h","h horiz",nbins,xmin,xmax); h->FillRandom("gaus",1000); h->SetFillColor(kRed); Float_t ymin = 0; Float_t ymax = 1.1*h->GetMaximum(); TCanvas *c1 = new TCanvas("c1"); c1->SetFillColor(33); c1->DrawFrame(ymin,xmin,ymax,xmax); //loop on bins and draw a TPave Float_t width = 0.25; Float_t xbinmin = ymin; TPave *pave; for (Int_t i=1;i<=nbins;i++) { Float_t xbinmax = h->GetBinContent(i); Float_t ybin = h->GetBinCenter(i); Float_t ybinmin = ybin -width*h->GetBinWidth(i); Float_t ybinmax = ybin +width*h->GetBinWidth(i); pave = new TPave(xbinmin,ybinmin,xbinmax,ybinmax); pave->SetFillColor(h->GetFillColor()); pave->Draw(); } } Hiroki Sato wrote: > > Hi > > Does someone know how to rotate 1D histograms > by 90 degrees, so that they grow horizontally? > > Hiroki Sato, Kyoto Univ/RIKEN > Bldg. 510C, Brookhaven Lab., > Upton NY, 11973 > Tel. 631-344-8087
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