df008_createDataSetFromScratch.py File Reference

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	df008_createDataSetFromScratch

Detailed Description

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

import ROOT

# We create an empty data frame of 100 entries
tdf = ROOT.ROOT.RDataFrame(100)

# We now fill it with random numbers
ROOT.gRandom.SetSeed(1)
tdf_1 = tdf.Define("rnd", "gRandom->Gaus()")

# And we write out the dataset on disk
tdf_1.Snapshot("randomNumbers", "df008_createDataSetFromScratch.root")

Date

June 2017

Author

Danilo Piparo

Definition in file df008_createDataSetFromScratch.py.