On Wed, 13 Aug 2003, Rene Brun wrote: Thank you for your help. I'd like to know two points more: 1. Is there a difference between h2.Draw() and h2->Draw() 2. To return to the previous question: if i have NTuple with the column E_t, how can I get the TH1D I need (with the XAxis = X_t) from it. It is not clear for me how to work with NTuple, I need an exsample. > Well, in this case, you have to > -create a new histogram with the right limits in X_t > - loop on the original histogram bins > - getting the bin content > - computing the new bin in the new histogram > - call SetBinContent(newbin,bincontent) > > You must be careful with bin edge effects. A reason to start from the > original data (Tree or..) instead of the above procedure. > > Rene Brun > > Anufriev Sergey Valentinovich wrote: > > > > But, in fact E_t is the XAxis. And I need XAxis will be X_t. I need not > > to normalize my histogram. > > > > > Hi Sergey, > > > > > > Having TH1D* h, do > > > h->Scale(2/sqrt(s)); > > > > > > see also TH1::DrawNormalized > > > > > > Rene Brun > > > > > > Anufriev Sergey Valentinovich wrote: > > > > > > > > Dear ROOTers! > > > > > > > > I have the next problem: I can draw TH1D which shows dependense CROSS > > > > SECTION (E_transeverse), but in fact I need histogram CROSS > > > > SECTION(X_transeverse), where X_transeverse=2*E_transeverse/SQRT(s) (just > > > > one can say X_t=f(E_t)). Question is: how can I get it? > > > > > > > > Thank you in advance, Sergey. > > > >
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