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df008_createDataSetFromScratch.py
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## \file
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## \ingroup tutorial_dataframe
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## \notebook -nodraw
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## Create data from scratch with RDataFrame.
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##
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## This tutorial shows how to create a dataset from scratch with RDataFrame
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##
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## \macro_code
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##
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## \date June 2017
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## \author Danilo Piparo (CERN)
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import
ROOT
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# We create an empty data frame of 100 entries
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df =
ROOT.RDataFrame
(100)
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# We now fill it with random numbers
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ROOT.gRandom.SetSeed(1)
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df_1 = df.Define(
"rnd"
,
"gRandom->Gaus()"
)
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# And we write out the dataset on disk
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df_1.Snapshot(
"randomNumbers"
,
"df008_createDataSetFromScratch_py.root"
)
ROOT::RDataFrame
ROOT's RDataFrame offers a modern, high-level interface for analysis of data stored in TTree ,...
Definition
RDataFrame.hxx:41
tutorials
dataframe
df008_createDataSetFromScratch.py
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