Re: TTree::Draw marker-color fails if "same" option used

From: Rene Brun <Rene.Brun_at_cern.ch>
Date: Thu, 18 Sep 2008 10:32:21 +0200

Could you try the following logic?

 gStyle->SetPalette(1,0);

 T->SetMarkerStyle(22);
 T->SetMarkerSize(1);
 T->Draw("a:b:a+c>>h1(0,1,0,1)","","zcol");

 TH2F *h1 = (TH2F*)gPad->GetPrimitive("h1");  T->SetMarkerSize(2);
 T->Draw("a:b:a+c>>h2(-4,4,-4,4)","b > 0.5","zcol");  TH2F *h2 = (TH2F*)gPad->GetPrimitive("h2");  h1->Draw("zcol");
 h2->Draw("same");

Rene Brun

Benjamin Monreal wrote:
>
> I want to make a scatter plot in which the points are colored
> according to a variable. However, I want some of the points large
> and some small. Here's how I try to do it:
>
> TNtuple* nt = new TNtuple("nt","nt","a:b:c"); //random data for
> illustration
> for (int i=0;i<1000;i++)
> nt->Fill(gRandom->Rndm(),gRandom->Rndm(),gRandom->Rndm());
>
> gStyle->SetPalette(1,0);
> nt->SetMarkerStyle(22);
> nt->SetMarkerSize(1);
> nt->Draw("a:b:a+c","","zcol"); // This correctly draws and colors
> all of the small points ...
> nt->SetMarkerSize(2);
> nt->Draw("a:b:a+c","b > 0.5","zcol same"); // but these points all
> come out green.
>
> What's going on, and is there a way around it?
>
> Thanks,
>
> -Ben Monreal
>
>
>
> ------------------------------------------------------------------------
>
>
>
>
Received on Thu Sep 18 2008 - 10:32:58 CEST