Crash at macro exit

ROOT
1

Dear ROOTers,

Using ROOT version 5.34.10, I load a TFile which contains many trees, as listed in the macro below:

root -l treefile.root

I execute the following macro (.x macro.c) after loading the file as shown above:

{
TCanvas c1;

TH1D test1("test1","test",5,50.,200.);
test1.Sumw2();
TH1D test2("test2","test",5,50.,200.);
test2.Sumw2();

tt_nom->Draw("mbb>>test1","mct>160 && met>100 && mbb>50 && mt>40 && nbj==0 && mt>100");
tt_powhegjimmy->Draw("mbb>>test2","mct>160 && met>100 && mbb>50 && mt>40 && nbj==0 && mt>100");

c1.Clear();
c1.SetLogy();

test1.Draw("e");
test2.SetLineColor(kRed);
test2.Draw("esame");
}

It works fine, but it vomits all sort of crap when I exit CINT after execution. If I convert this macro into a c function (shown below), it works better (no error message) but the canvas doesn’t appear.

void macro() {
TCanvas c1;

TH1D test1("test1","test",5,50.,200.);
test1.Sumw2();
TH1D test2("test2","test",5,50.,200.);
test2.Sumw2();

tt_nom->Draw("mbb>>test1","mct>160 && met>100 && mbb>50 && mt>40 && nbj==0 && mt>100");
tt_powhegjimmy->Draw("mbb>>test2","mct>160 && met>100 && mbb>50 && mt>40 && nbj==0 && mt>100");

c1.Clear();
c1.SetLogy();

test1.Draw("e");
test2.SetLineColor(kRed);
test2.Draw("esame");
}

I feel this is simple, but is there a way I can execute this code without a massive seg fault and a canvas?

Thanks in advance,

Andrée

2

Hi Andree,

There is a scope issue with your code (see for example this page). Try this way:

[code]TCanvas *macro()
{
TCanvas *c1 = new TCanvas();

TH1D *test1 = new TH1D(“test1”,“test”,5,50.,200.);
test1->Sumw2();
TH1D *test2 = new TH1D(“test2”,“test”,5,50.,200.);
test2->Sumw2();

tt_nom->Draw(“mbb>>test1”,“mct>160 && met>100 && mbb>50 && mt>40 && nbj==0 && mt>100”);
tt_powhegjimmy->Draw(“mbb>>test2”,“mct>160 && met>100 && mbb>50 && mt>40 && nbj==0 && mt>100”);

c1->Clear();
c1->SetLogy();

test1->Draw(“e”);
test2->SetLineColor(kRed);
test2->Draw(“esame”);
return c1;
}
[/code]
Cheers, Bertrand.

3

Thanks, it works fine now!

Andrée