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df008_createDataSetFromScratch.C File Reference

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Create data from scratch with RDataFrame.

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

// We create an empty data frame of 100 entries
// We now fill it with random numbers
auto df_1 = df.Define("rnd", []() { return gRandom->Gaus(); });
// And we write out the dataset on disk
df_1.Snapshot("randomNumbers", "df008_createDataSetFromScratch.root");
R__EXTERN TRandom * gRandom
Definition TRandom.h:62
ROOT's RDataFrame offers a modern, high-level interface for analysis of data stored in TTree ,...
virtual Double_t Gaus(Double_t mean=0, Double_t sigma=1)
Samples a random number from the standard Normal (Gaussian) Distribution with the given mean and sigm...
Definition TRandom.cxx:275
virtual void SetSeed(ULong_t seed=0)
Set the random generator seed.
Definition TRandom.cxx:615
June 2017
Danilo Piparo (CERN)

Definition in file df008_createDataSetFromScratch.C.