doc/v624/df024__Display_8C.html

void df024_Display()

{

   // Setting up a Dataframe with some data

   unsigned long long y = 1;

   int x = 1;

   double w = 1;

   double z = 1;

   ROOT::RDataFrame df(10);

   auto d = df.Define("y", [&y]() { return y *= 100; }) // A column with ulongs

              .Define("x",

                      [&x]() {

                         return std::vector<int>({x++, x++, x++, x++});

                      })                                // A column with four-elements collection

              .Define("w", [&w]() { return w *= 1.8; }) // A column with doubles

              .Define("z", [&z]() {

                 z *= 1.1;

                 return std::vector<std::vector<double>>({{z, ++z}, {z, ++z}, {z, ++z}});

              }); // A column of matrices


   // Preparing the RResultPtr<RDisplay> object with all columns and default number of entries

   auto d1 = d.Display("");

   // Preparing the RResultPtr<RDisplay> object with two columns and default number of entries

   auto d2 = d.Display({"x", "y"});


   // Printing the short representations, the event loop will run

   std::cout << "The following is the representation of all columns with the default nr of entries" << std::endl;

   d1->Print();

   std::cout << "\n\nThe following is the representation of two columns with the default nr of entries" << std::endl;

   d2->Print();

}

d
#define d(i)
Definition RSha256.hxx:102

ROOT::RDataFrame
ROOT's RDataFrame offers a high level interface for analyses of data stored in TTrees,...
Definition RDataFrame.hxx:42

y
Double_t y[n]
Definition legend1.C:17

x
Double_t x[n]
Definition legend1.C:17

df024_Display
Definition df024_Display.py:1