Compiler Error when filling Ntuples with a vector

Recording, Visualizing and Persisting Data
1

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Geant4 Version:11.2.2
Operating System:Ubuntu 22.04
Compiler/Version:11.4.0
CMake Version:3.22.1

Dear Experts,

I’m running example B5 to learn how to fill ntuples with std::vectors. The example compiles and runs without problems. I tried to add a column myself to see if I could do it and the program does not compile anymore. Here’s what I did:

In EventAction.hh

class EventAction : public G4UserEventAction
private:
  std::vector<G4double> vec_test;

In EventAction.cc

void EventAction::BeginOfEventAction(const G4Event*)
{
  vec_test={0.1, 0.2, 0.3};
}
void EventAction::EndOfEventAction(const G4Event* event)
{
  analysisManager->FillNtupleDColumn(8, vec_test);
  analysisManager->AddNtupleRow();
}

And of course in RunAction.cc

analysisManager->CreateNtupleDColumn("Test", fEventAction->vec_test);

The compiler error I get is:

/home/dboccanfuso/geant4_local/test_range/B5/src/EventAction.cc: In member function ‘virtual void B5::EventAction::EndOfEventAction(const G4Event*)’:
/home/dboccanfuso/geant4_local/test_range/B5/src/EventAction.cc:240:37: error: no matching function for call to ‘G4GenericAnalysisManager::FillNtupleDColumn(int, std::vector<double>&)’
  240 |   analysisManager->FillNtupleDColumn(8, vec_test);

I don’t see where my error lies.

3

Pinging @ivana and @gybarran for their input.

4

Hello,

You should remove the line

analysisManager->FillNtupleDColumn(8, vec_test);

as the function FillNtupleDColumn should be used for columns of the double value type. To fill a vector, the vector should be updated in your application, and then it will be filled (saved) automatically at AddNtupleRow() call.

For example, in your use case:

void EventAction::EndOfEventAction(const G4Event* event)
{
  vec_test[0] = 0.5;
  vec_test[1] = 0.6;
  // Fill columns of value types is present
  analysisManager->AddNtupleRow();
}

You can find the example of usage of ntuple vector columns in basic example B5.

Best regards,