Hi!
I think the easiest solution is to define the histo with the draw
command. Two options:
1. myTree->Draw("var1:var2>>histo",cut);
makes a new histogramm with the name "histo". afaik then one can
modify histo
2. myTree->Draw("var1:var2>>histo2(100,0,1,100,0,1)",cut);
makes a 2d histogram with 100 bins x, 100 bins y
Greets
Michael
Philippe Canal writes:
> Hi,
>
> When doing: myTree->Draw("var1:var2",cut);
> rather than drawing an histogram, ALL the data is drawn using a TPolyMarker.
>
> The simpliest solution is to set a default marker for the tree:
> myTree->SetMarkerStyle(3);
> myTree->Draw("var1:var2",cut);
> Or after the fact you can do
> myTree->Draw("var1:var2",cut);
> p = dynamic_cast<TPolyMaker*>(
> gPad->GetListOfPrimitives()->FindObject("TPolyMaker") );
> if (p) p->SetMarketStyle(3);
>
> Cheers,
> Philippe.
>
> -----Original Message-----
> From: owner-roottalk@pcroot.cern.ch [mailto:owner-roottalk@pcroot.cern.ch]On
> Behalf Of Stilianos Kesisoglou
> Sent: Tuesday, July 29, 2003 3:13 PM
> To: roottalk@pcroot.cern.ch
> Subject: [ROOT] marker when a tree is drawn
>
>
> Hi,
>
> I am having a problem to set the marker size and style when I draw
> directly from a tree:
>
> myTree->Draw("var1:var2",cut);
>
> If I try to set the marker attributes for the histogram "htemp" there is
> no effect. The same happens
> if I try to do it interactively with the mouse.
>
> When I first book a TH2F histogram (named "histo") and then I do:
>
> myTree->Draw("var1:var2>>histo",cut);
>
> then I can set the marker attributes for the histogram "histo".
>
> Any way to do it directly on the first case without booking a histogram?
>
> Thanks!
>
> Stelios.
>
>
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