Hi Rene, I would be happy with the first case but I mean (norm for pixid==0 and pdid=0) against (norm for pixid=0 and pdid=37) So if I want to do let's say x versus y I do h10->Draw("x:y"), easy but what about my case where I need x versus x with 2 different options... ? Is it possible ? I guess I can't do that. Thus I would need to extract the data from the ntuple to put it on a 2d histogram... Cheers On Thu, 11 Apr 2002, Rene Brun wrote: > Hi Reinhardt, > > What do you mean by > "plot norm for pdid=0 and pixid=1 against norm for pdid=0" > > Do you mean :Superimposing two histograms obtained with > different selection criteria? > A scatter-plot? of what versus what? > > Assuming you mean the first case, you can do: > h10->Draw("norm","pdid==0 && pixid==1"); > h10->Draw("norm","pdid==0 && pixid==37","same"); > > Rene Brun > > On Thu, 11 Apr 2002, Reinhardt Chamonal wrote: > > > Hi, > > As I am still a starter at root I still have basic questions... > > I am trying to plot one ntuple variable against the same one but with > > different parameters.. > > So I have a variable called norm which depends on pdid and pixid. > > For example I can plot norm for pdid=0 and pixid=0 using the following > > way: > > h10->Draw("norm","pdid==0 && pixid==1"); > > A second histogram could be: > > h10->Draw("norm","pdid==0 && pixid==37"); > > Now I would like to basically plot the two histograms againt one > > another..ie plot norm for pdid=0 and pixid=1 against norm for pdid=0 and > > pixid=37. > > I am ok doing so for the same parameters but different variables, but > > here I have the same variable against different parameters. To do so can I do > > something like ? > > h10->Draw("norm:norm","pdid==0 && pixid==1","pdid==0 && pixid==1"); > > or is it better to read the data and fill a 2D histogram or a compare > > directly the 2 histograms... > > Otherwise how do I do ? > > > > Hope you understood my problem wasn't easy to explain... > > Cheers. > > > -- ------------------------------------------------------------ Reinhardt CHAMONAL The University of Edinburgh Dept. of Physics & Astronomy email: chamonal@ph.ed.ac.uk King's Buildings, JCMB, 5301 Mayfield Road phone: +44-131-650 5307 Edinburgh, EH9 3JZ web: http://www.ph.ed.ac.uk/~chamonal/ http://www.reuh.fr.st ------------------------------------------------------------
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