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Reference Guide
df008_createDataSetFromScratch.C File Reference

Detailed Description

View in nbviewer Open in SWAN This tutorial shows how to create a dataset from scratch with RDataFrame

// We create an empty data frame of 100 entries
ROOT::RDataFrame tdf(100);
// We now fill it with random numbers
auto tdf_1 = tdf.Define("rnd", []() { return gRandom->Gaus(); });
// And we write out the dataset on disk
tdf_1.Snapshot("randomNumbers", "df008_createDataSetFromScratch.root");
June 2017
Danilo Piparo

Definition in file df008_createDataSetFromScratch.C.