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timeSeriesFromCSV.py
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1## \file
2## \ingroup tutorial_graphs
3## \notebook -js
4## This macro illustrates the use of the time axis on a TGraph
5## with data read from a text file containing the SWAN usage
6## statistics during July 2017.
7##
8## \macro_image
9## \macro_code
10##
11## \authors Danilo Piparo, Olivier Couet
12
13import ROOT
14
15# Open the data file. This csv contains the usage statistics of a CERN IT
16# service, SWAN, during two weeks. We would like to plot this data with
17# ROOT to draw some conclusions from it.
18dirName = str(ROOT.gROOT.GetTutorialDir())
19dirName += "/graphs/"
20dirName= dirName.replace("/./", "/")
21inputFileName = "%s/SWAN2017.dat" %dirName
22
23# Create the time graph
24g = ROOT.TGraph()
25g.SetTitle("SWAN Users during July 2017;Time;Number of Sessions")
26
27# Read the data and fill the graph with time along the X axis and number
28# of users along the Y axis
29
30lines = open(inputFileName, "r").readlines()
31
32for i, line in enumerate(lines):
33 d, h, value = line.split()
34 g.SetPoint(i, ROOT.TDatime("%s %s" %(d,h)).Convert(), float(value))
35
36# Draw the graph
37c = ROOT.TCanvas("c", "c", 950, 500)
38c.SetLeftMargin(0.07)
39c.SetRightMargin(0.04)
40c.SetGrid()
41g.SetLineWidth(3)
42g.SetLineColor(ROOT.kBlue)
43g.Draw("al")
44g.GetYaxis().CenterTitle()
45
46# Make the X axis labelled with time
47xaxis = g.GetXaxis()
48xaxis.SetTimeDisplay(1)
49xaxis.CenterTitle()
50xaxis.SetTimeFormat("%a %d")
51xaxis.SetTimeOffset(0)
52xaxis.SetNdivisions(-219)
53xaxis.SetLimits(ROOT.TDatime(2017, 7, 3, 0, 0, 0).Convert(), ROOT.TDatime(2017, 7, 22, 0, 0, 0).Convert())
54xaxis.SetLabelSize(0.025)
55xaxis.CenterLabels()
56