Christoph Ernst wrote: > > Hello, > > Is there a simple way to rescale the y-axis of a TH1 when you plot it from > TTree::Draw()? > For example I want to draw a pt spectrum via tree->Draw("pt"). But as > 1/pt * dN/dpt not just as dN/dpt. > Also, I would like to plot histos from a Tree where each entry has a > specific weight w (something like dw/dx). In a loop I would simply say > h1->Fill(x_i, w_i);. > But I cannot figure out how to do this in the nice way of TTree::Draw(). > If TTree::Draw() can't do it, what do you think is the best alternative? > > Greetings > Christoph > Hi Christoph, The way I always do this is : tree->Draw("pt","1.*1./pt") -- Cheers, _/_/ _/ _/ _/_/_/_/ _/ _/ _/ _/ _/ _/ _/ _/ _/ _/ _/ _/ _/ _/ _/_/ _/ _/_/ _/ _/ _/ _/ _/ _/ _/ _/_/_/_/ _/ _/ *----------------------------------------------------------------------* Dr. Nick van Eijndhoven Department of Subatomic Physics email : nick@phys.uu.nl Utrecht University / NIKHEF tel. +31-30-2532331 (direct) P.O. Box 80.000 tel. +31-30-2531492 (secr.) NL-3508 TA Utrecht fax. +31-30-2518689 The Netherlands WWW : http://www.phys.uu.nl/~nick Office : Ornstein lab. 172 ---------------------------------------------------------------------- tel. +41-22-7679751 (direct) CERN PPE Division / ALICE exp. tel. +41-22-7675857 (secr.) CH-1211 Geneva 23 fax. +41-22-7679480 Switzerland CERN beep : 13+7294 Office : B 160 1-012 *----------------------------------------------------------------------*
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