Hi Thomas,
Why don't you just make cuts:
t200->Draw("x:z","abs(x - 2000) <= 400 && abs(y) <= 800")
Yours,
Christian Holm Christensen -------------------------------------------
Address: Sankt Hansgade 23, 1. th. Phone: (+45) 35 35 96 91
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Email: cholm@nbi.dk Web: www.nbi.dk/~cholm
On Tue, 12 Mar 2002 13:33:38 +0100 (CET)
Thomas Schietinger <Thomas.Schietinger@cern.ch> wrote
concerning "[ROOT] TTree::Draw into a predefined frame":
> Hello,
>
> I would like to draw the entries of an ntuple into
> a given frame. In PAW (sorry...) this was rather easy:
>
> null 2000 2800 -800 800
> nt/plot 200.x%z ! ! ! ! s
>
> >From various examples I find online I gather that
> a TH2F and the "same" option should give me a similar
> result:
>
> TH2F *TA1xz = new TH2F("TA1xz","TA1 x-z",100,2000,2800,100,-800,800);
> TA1xz->Draw();
> t200->Draw("x:z","","same");
>
> However, this just gives me the empty histogram,
> no trace of the ntuple! (Canvas update doesn't help
> either.) Of course I can draw directly into the histogram,
>
> TH2F *TA1xz = new TH2F("TA1xz","TA1 x-z",100,2000,2800,100,-800,800);
> t200->Draw("x:z>>TA1xz");
> TA1xz->Draw();
>
> but then all structures are washed out by the histogram
> binning (unless I go to unreasonably fine binning).
> Another work-around would be the application of cuts,
> but I would *really* like to decide for myself where
> exactly my plot starts (important for comparisons etc.).
> So why does the first method above not work, or is there
> another way to solve my problem, 2D tree drawing with
> predefined boundaries?
>
> Any advice much appreciated! Thanks,
>
> Thomas
>
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