void createInput(){

ROOT::Experimental::TDataFrame d(10);

TRandom r(1);
auto m1_p1 = [&r](){return (int) std::signbit(r.Uniform(-1,1))*2-1;};
auto zero_p10 = [&r](){return (float) r.Uniform(0,10);};
auto ret_vec_size3 = [&zero_p10](){std::vector<float> v{zero_p10(), zero_p10(), zero_p10()};return v;};
auto ret_vec_size3_c = [&m1_p1](){std::vector<int> v {m1_p1(), m1_p1(), m1_p1()}; return v;};

d.Define("VetoMu_px",ret_vec_size3)
 .Define("VetoMu_py",ret_vec_size3) 
 .Define("VetoMu_pz",ret_vec_size3)
 .Define("VetoMu_en",ret_vec_size3)
 .Define("VetoMu_charge",ret_vec_size3_c)
 .Snapshot("mytree","myfile.root");


}