df008_createDataSetFromScratch.py File Reference

Detailed Description

Create data from scratch with RDataFrame.

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

 
import ROOT
 
# We create an empty data frame of 100 entries
df = ROOT.RDataFrame(100)
 
# We now fill it with random numbers
ROOT.gRandom.SetSeed(1)
df_1 = df.Define("rnd", "gRandom->Gaus()")
 
# And we write out the dataset on disk
df_1.Snapshot("randomNumbers", "df008_createDataSetFromScratch_py.root")

Date

June 2017

Author

Danilo Piparo (CERN)

Definition in file df008_createDataSetFromScratch.py.