Hi, You have two options: option1: you know the histogram range ===================================== TH1F *hframe = new TH2F("hframe","a title",40,xmin,xmax,40,ymin,ymax); hframe->Draw(); //you can set the axis att via hframe->GetXaxis().. tree->Draw("data1:data2","',"same"); option2: you do not know the histogram range ============================================ //make a first pass to get htemp tree->Draw("data1:data2"); TH1F *hframe = (TH1F*)htemp->Clone("hframe"); hframe->Draw(); tree->Draw("data1:data2","',"same"); Rene Brun On Thu, 6 Nov 2003 A.Dietz@mpi-hd.mpg.de wrote: > Hello Rooters, > > my questions maybe were posted several times before, but I cannot find any > sufficient answer in the roottalk-forum. > > > My question: How can I get the pointer to the x-axis and y-axis when I am > creating a tree-plot? > > The answer given in most cases is to redirect the draw into a histogram, > e.g. > > tree->Draw("data1:data2>>htemp") > > and to use this htemp-histogram. But this is not what I want! In most > cases this histogram differs significant from a plot created by: > > tree->Draw("data1:data2") !!! > > > So how can I get the axis from the original tree-plot to set titles, to > get the xmin and xmax-values and to obtain other informations. > > > Thanks a lot in advance, > Alexander Dietz >
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