Hist->SetFillColor

ROOT
1

Dear experts,

I called the hist->SetFillColor(a_color), see[1], for my hist but when I open the root file, the hist is not fill. When I use the hist->SetLineColor(a_color) everything work. Can you please tell me what is wrong?

[1]
code.h
for(int i=0; i<9; i++) {
hmass[i] = new TH1D(vdir[i].c_str(), vdir[i].c_str(), 200, 0, 3000);
hmass[i]->SetLineWidth(2);
if(sample.find(“M50”) !=std::string::npos) hmass[i]->SetFillColor(kGreen);
if(sample.find(“M125”) !=std::string::npos) hmass[i]->SetFillColor(kRed);
if(sample.find(“M200”) !=std::string::npos) hmass[i]->SetFillColor(kMagenta);
if(sample.find(“M300”) !=std::string::npos) hmass[i]->SetFillColor(kBlue);
}

code.C
void SVfitMEM::Loop(){
for (Long64_t jentry=0; jentry<nentries;jentry++) {

   hmass[0] ->Fill(Mass0);
   hmass[1] ->Fill(Mass1);
    ...
   hmass[9] ->Fill(svfitMass9);
  }
for(int i=0; i<9; i++) hmass[i]->Write();

}

2

It works for me. See the attached picture.

Screen Shot 2016-01-22 at 11.19.23.png692×1006 202 KB

3

Dear Couet,

my code is more complicate then yours. Maybe something wrong is happening but the SetFillColor is not working. I send you the code that I’m using, can you please have a look, do you see something wrong?

1- file.h
2- file.C
3- main.cc
4- root file: calpas.web.cern.ch/calpas/svFitS … 0_all.root
5- makefile: calpas.web.cern.ch/calpas/Makefile

you can run with:
1- make
2- ./do.exe

this will create a root file in which the hist are not Fill with color.

Regards
main.cc (2.33 KB)
SVfitMEM.C (4.52 KB)
SVfitMEM.h (33.1 KB)

4

cannot download the makefile

5

Can you please try again, and use this new main.cc.

Regards
main.cc (2.32 KB)

6

When I click on the link to get your Makefile I get an error 404…
May be just attached it here.

7

Sorry! it’s working now…

8

Your histograms have error bars. By default they are plotter suing error bars. If you what to see them as bar chart do:

hadhad_smeared_vismass->Draw("hist");
9

Dear couet,

what I want is to see the hist fill with color when using hist->SetFillColor(color).
right now I’m writing the hist in a root file (no ->Draw()) involve.
Where do you want me to call a Draw(“hist”)?
when I did at line 124 of file.C:
for(int i=0; i<9; i++) { hmass[i]->Draw(“hist”); hmass[i]->Write(); }
it still not working. Do you know what is wrong?

Regards

10

Yes you write the histograms… I got that… and they are stored with the correct fill color… you can see that when later you Draw them with the “hist” option .

Now the question is: how did you see it is not working ?

11

Dear Couet,

ok I got it! using ->Draw(“hist”) fixed the issue.
Thank you for your help.

Regards

12

=D>

13

:smiley: