class Waveform{
    public:
        double x[1024];
        double y[1024];
        Waveform(){};
};

class Event : public TObject{
    public:
        vector<Waveform> w;

    ClassDef(Event, 1);
}

ClassImp(Event)

void macro(){
    TFile *outputFile = new TFile("output.root","RECREATE");

    TTree *tree = new TTree("tree","treeliberated tree");

    Int_t nevent = 2;
    Int_t noWaveforms = 3; //it is not used in this case

    Event* e = new Event;

    TRandom3 generator;

    tree -> Branch("waveform", &e);

    for(Int_t iev = 0; iev < nevent; iev++){

        double marInterv = (double) 2*TMath::Pi()/1023;

        for(int i = 0; i<noWaveforms; i++){

            int counter = 0;
            double current = 0;

            double a = generator.Uniform(1,10);

            e->w.push_back(Waveform());

            while(current <= 2*TMath::Pi() + marInterv){

                e->w[i].x[counter] = current;
                e->w[i].y[counter] = a*TMath::Sin(current);

                current = current + marInterv;
                counter++;
            }

        }
        tree -> Fill();

        e->w.clear();

    }

    tree -> Write();

    tree -> StartViewer();
    TCanvas *canv = new TCanvas();
    canv -> cd(1);

    tree -> Draw("w.y:w.x");
    
    outputFile->Close();

}