Error with TGraph::SetTitle

Newbie
1

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ROOT Version: 6.26/00
Platform: arm64 apple m1
Compiler: xcode12

Dear expert,

when I run this macro without grms::SetTitle everything works.
If I define the name of each graph it gives me the error you see below.

Why does this happen?

    TCanvas *c2[M];
    TGraph *grms[M];
    for(int ttc=0; ttc<M; ttc++){
    c2[ttc] = new TCanvas( Form("c2_%d",ttc),Form("c2_%d",ttc));
    }
    for(int ttc=0; ttc<M; ttc++){
    grms[ttc]= new TGraph();
    for(int bbb=0; bbb<nt; bbb++){
    
    grms[ttc]->SetPoint(bbb, time[ttc][bbb], rms[ttc][bbb]);
    }
    grms[ttc]->SetName("RMS/t");
    //grms[ttc]->SetTitle("Graph RMS/t");    //this work fine but is generic
        grms[0]->SetTitle("Itot[uA]");
        grms[1]->SetTitle("Ie[uA]");
        grms[2]->SetTitle("Ih[uA]");
        grms[3]->SetTitle("Ieg[uA]");
        grms[4]->SetTitle("Ihg[uA]");
        grms[5]->SetTitle("BB[mV]");
        grms[6]->SetTitle("CSA[mV]");
        grms[7]->SetTitle("Charge[fC]");
        
        grms[ttc]->SetMarkerColor(4);
    grms[ttc]->SetMarkerStyle(21);
                c2[ttc]->cd();
                c2[ttc]->SetGrid();
                c2[ttc]->SetTicks();
                grms[ttc]->Draw();
    // use this methods
    grms[ttc]->GetXaxis()->SetTitle("time (ns)");
    grms[ttc]->GetYaxis()->SetTitle("rms");
        }

Problem is the “Break Segmentation Violation” ,there is only when naming curves.

Warning in <TCanvas::Constructor>: Deleting canvas with same name: c2_0
Warning in <TCanvas::Constructor>: Deleting canvas with same name: c2_1
Warning in <TCanvas::Constructor>: Deleting canvas with same name: c2_2
Warning in <TCanvas::Constructor>: Deleting canvas with same name: c2_3
Warning in <TCanvas::Constructor>: Deleting canvas with same name: c2_4
Warning in <TCanvas::Constructor>: Deleting canvas with same name: c2_5
Warning in <TCanvas::Constructor>: Deleting canvas with same name: c2_6
Warning in <TCanvas::Constructor>: Deleting canvas with same name: c2_7

 *** Break *** segmentation violation
 [/usr/lib/system/libsystem_platform.dylib] _sigtramp (no debug info)
[/Users/roany/Downloads/landaulgad/exam5bc_C.so] graph(char const*) (no debug info)
[<unknown binary>] (no debug info)
[/Users/roany/Downloads/root2/lib/libCling.6.26.00.so] cling::IncrementalExecutor::executeWrapper(llvm::StringRef, cling::Value*) const (no debug info)
[/Users/roany/Downloads/root2/lib/libCling.6.26.00.so] cling::Interpreter::RunFunction(clang::FunctionDecl const*, cling::Value*) (no debug info)
[/Users/roany/Downloads/root2/lib/libCling.6.26.00.so] cling::Interpreter::EvaluateInternal(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, cling::CompilationOptions, cling::Value*, cling::Transaction**, unsigned long) (no debug info)
[/Users/roany/Downloads/root2/lib/libCling.6.26.00.so] cling::Interpreter::process(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, cling::Value*, cling::Transaction**, bool) (no debug info)
[/Users/roany/Downloads/root2/lib/libCling.6.26.00.so] cling::MetaProcessor::process(llvm::StringRef, cling::Interpreter::CompilationResult&, cling::Value*, bool) (no debug info)
[/Users/roany/Downloads/root2/lib/libCling.6.26.00.so] HandleInterpreterException(cling::MetaProcessor*, char const*, cling::Interpreter::CompilationResult&, cling::Value*) (no debug info)
[/Users/roany/Downloads/root2/lib/libCling.6.26.00.so] TCling::ProcessLine(char const*, TInterpreter::EErrorCode*) (no debug info)
[/Users/roany/Downloads/root2/lib/libRint.6.26.00.so] TRint::ProcessLineNr(char const*, char const*, int*) (no debug info)
[/Users/roany/Downloads/root2/lib/libRint.6.26.00.so] TRint::HandleTermInput() (no debug info)
[/Users/roany/Downloads/root2/lib/libCore.6.26.00.so] TUnixSystem::CheckDescriptors() (no debug info)
[/Users/roany/Downloads/root2/lib/libCore.6.26.00.so] TMacOSXSystem::DispatchOneEvent(bool) (no debug info)
[/Users/roany/Downloads/root2/lib/libCore.6.26.00.so] TSystem::InnerLoop() (no debug info)
[/Users/roany/Downloads/root2/lib/libCore.6.26.00.so] TSystem::Run() (no debug info)
[/Users/roany/Downloads/root2/lib/libCore.6.26.00.so] TApplication::Run(bool) (no debug info)
[/Users/roany/Downloads/root2/lib/libRint.6.26.00.so] TRint::Run(bool) (no debug info)
[/users/roany/downloads/root2/bin/root.exe] main (no debug info)
[/usr/lib/system/libdyld.dylib] start (no debug info)

thanks

2

It is because you give the same name to all the graphs.

1 Like
3

thanks, for answer me.
I should create 8 TCanvas?

4

You already create M canvases. The problem is you are trying to use SetName on graphs that you still have not created. Use a ‘good’ indentation on your code and it may be clearer to you.

5

thanks for answer me.


TCanvas *h2[M];
    TGraph *grms[M];
    for(int ttc=0; ttc<M; ttc++){
    h2[ttc] = new TCanvas( Form("h2_%d",ttc),Form("h2_%d",ttc));
    }
    for(int ttc=0; ttc<M; ttc++){
    //grms[ttc]= new TGraph();
        grms[0]=new TGraph();
        grms[1]=new TGraph();
        grms[2]=new TGraph();
        grms[3]=new TGraph();

        
        
    for(int bbb=0; bbb<nt; bbb++){
       
    grms[ttc]->SetPoint(bbb, time[ttc][bbb], rms[ttc][bbb]);
    }
    
        grms[0]->SetName("itot");
        grms[1]->SetName("ie");
        grms[2]->SetName("ih");
        grms[3]->SetName("ieg");
     
        
     grms[ttc]->SetLineStyle(1);
     grms[ttc]->SetLineWidth(5);
     grms[ttc]->SetLineColor(3);
     grms[ttc]->SetMarkerColor(2);
    
    grms[0]->SetTitle("Itot[uA]");
    grms[1]->SetTitle("Ie[uA]");
    grms[2]->SetTitle("Ih[uA]");
    grms[3]->SetTitle("Ieg[uA]");

   
    h2[ttc]->cd();
    h2[ttc]->SetGrid();
    h2[ttc]->SetTicks();
    grms[ttc]->Draw();
    grms[ttc]->GetXaxis()->SetTitle("time (ns)");
    grms[ttc]->GetYaxis()->SetTitle("rms");
        
        TFile *f1 = new TFile( "grms.root", "RECREATE" );
        f1->cd(); 
          
      
      for(int qq=0; qq<M; qq++){
          
          
          grms[qq]->Write();
          }
          
      f1->Close();

My question…

how to save all graph in one only Root file?

6

Create the TFile only one time, before the loop that creates the graphs (I’d say before even creating the canvases, in this case), and close it also once, outside.

1 Like