Hi,
You're right. I realized that actually mc and data histograms have
nearly the same number of entries, i.e., I didn't notice the
difference. Too bad :). Anyway I rescaled them already.
Tuan
On Wed, 31 Jul 2002, Rene Brun wrote:
> Hi Tuan,
>
> I am sorry, but I do not understand your point. The second histogram
> is drawn on top of the first histogram using the coordinate system
> defined by the first histogram. This may work if your MC histogram
> has about the same number of entries as the data histogram.
> If this is not the case, you should rescale the MC histogram
> via TH1::Scale to have the same integral as the data histogram.
>
> Rene Brun
>
>
> On Wed, 31 Jul 2002, Vu Anh Tuan wrote:
>
> > Hi,
> >
> > I've got a small question.
> >
> > I'm currently using root v3_02_07. I want to compare two histograms, say
> > Z mass from data and from MC, therefore I need to superimpose
> > them: z_data and z_mc. They need not to have the same entries
> > certainly. I thought normally I would have to scale one histogram to the
> > other using the function Scale() or smth like this. But as I was a
> > little bit lazy, I did first
> >
> > z_mc.Draw(), then
> > z_data.SetLineColor(kRed) and finally
> > z_data.Draw("E1same")
> >
> > in thinking of refining them later (I got about 60 histos to draw). But
> > surprisingly the plot I see appears to be rescaled already as I wanted
> > to be, was not supposed to do.
> >
> > Are things actually implemented like this or my pleasant unexpectation
> > turns out to be too early?
> >
> > Thanks,
> >
> > Tuan
> >
>
>
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