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df008_createDataSetFromScratch.py
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1## \file
2## \ingroup tutorial_dataframe
3## \notebook -nodraw
4## This tutorial shows how to create a dataset from scratch with RDataFrame
5##
6## \macro_code
7##
8## \date June 2017
9## \author Danilo Piparo
10
11import ROOT
12
13# We create an empty data frame of 100 entries
14tdf = ROOT.ROOT.RDataFrame(100)
15
16# We now fill it with random numbers
17ROOT.gRandom.SetSeed(1)
18tdf_1 = tdf.Define("rnd", "gRandom->Gaus()")
19
20# And we write out the dataset on disk
21tdf_1.Snapshot("randomNumbers", "df008_createDataSetFromScratch_py.root")
22