df008_createDataSetFromScratch.C File Reference

Detailed Description

Create data from scratch with RDataFrame.

This tutorial shows how to create a dataset from scratch with RDataFrame

 
void df008_createDataSetFromScratch()
{
   // We create an empty data frame of 100 entries
   ROOT::RDataFrame df(100);
 
   // We now fill it with random numbers
   gRandom->SetSeed(1);
   auto df_1 = df.Define("rnd", []() { return gRandom->Gaus(); });
 
   // And we write out the dataset on disk
   df_1.Snapshot("randomNumbers", "df008_createDataSetFromScratch.root");
}

Date

June 2017

Author

Danilo Piparo (CERN)

Definition in file df008_createDataSetFromScratch.C.