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df021_createTGraph.py
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1## \file
2## \ingroup tutorial_dataframe
3## \notebook -draw
4## Fill a TGraph using RDataFrame.
5##
6## \macro_code
7## \macro_image
8##
9## \date July 2018
10## \authors Enrico Guiraud, Danilo Piparo (CERN), Massimo Tumolo (Politecnico di Torino)
11
12import ROOT
13
14ROOT.ROOT.EnableImplicitMT(2)
15d = ROOT.RDataFrame(160)
16
17# Create a trivial parabola
18dd = d.Alias("x", "rdfentry_").Define("y", "x*x")
19
20graph = dd.Graph("x", "y")
21
22# This tutorial is ran with multithreading enabled. The order in which points are inserted is not known, so to have a meaningful representation points are sorted.
23c = ROOT.TCanvas()
24graph.Sort()
25graph.Draw("APL")
26c.SaveAs("df021_createTGraph.png")
27
28print("Saved figure to df021_createTGraph.png")
ROOT's RDataFrame offers a high level interface for analyses of data stored in TTree,...