using namespace TMVA::Experimental;

ROOT::RDataFrame df(5);
auto df2 = df.Define("x", "1.f*rdfentry_").Define("y", "-1.f*rdfentry_");

auto x = AsTensor<float>(df2);

std::cout << "RTensor from an RDataFrame:\n" << x << "\n\n";

auto x2 = AsTensor<float>(df2, {"x"}, MemoryLayout::ColumnMajor);

std::cout << "RTensor from a single column of the RDataFrame:\n" << x2 << "\n\n";