df029_SQlitePlatformDistribution¶

Use RDataFrame to display data about ROOT downloads.

In order to display the Platform Distribution of ROOT, we choose to create two TH1F histograms: one that includes all types of platforms, other filtering and classifying them. This procedure is using a lambda expression taking as parameter the values stored in the "Platform" column from the database. At the end, the histograms are filled with their specific demand regarding the platform's type.

Author: Alexandra-Maria Dobrescu
This notebook tutorial was automatically generated with ROOTBOOK-izer from the macro found in the ROOT repository on Monday, March 27, 2023 at 09:46 AM.

In [1]:

auto rdf = ROOT::RDF::FromSqlite("http://root.cern/files/root_download_stats.sqlite", "SELECT * FROM accesslog;");

TH1F hRootPlatform("hrootPlatform", "Platform Distribution", 7, 0, -1);
TH1F hShortRootPlatform("hShortRootPlatform", "Short Platform Distribution", 7, 0, -1);

auto fillRootPlatform = [&hRootPlatform, &hShortRootPlatform] ( const std::string &platform ) {
   TString Platform = platform;
   TString Platform_0(Platform(0,5));
   TString Platform_1(Platform(0,6));
   TString Platform_2(Platform(0,8));

   if ( Platform.Contains("win32") ){
     hShortRootPlatform.Fill(Platform_0,1);
   } else if ( Platform.Contains("Linux") ){
     hShortRootPlatform.Fill(Platform_0,1);
   } else if ( Platform.Contains("source") ){
     hShortRootPlatform.Fill(Platform_1,1);
   } else if ( Platform.Contains("macosx64") ){
     hShortRootPlatform.Fill(Platform_2,1);
   } else if ( Platform.Contains("IRIX64") ){
     hShortRootPlatform.Fill(Platform_1,1);
   }

   hRootPlatform.Fill(Platform,1);
};

rdf.Foreach( fillRootPlatform, { "Platform" } );

auto PlatformDistributionHistogram = new TCanvas();

hRootPlatform.GetXaxis()->LabelsOption("a");
hRootPlatform.LabelsDeflate("X");
hRootPlatform.DrawClone();

auto shortPlatformDistributionHistogram = new TCanvas();

hShortRootPlatform.GetXaxis()->LabelsOption("a");
hShortRootPlatform.LabelsDeflate("X");
hShortRootPlatform.DrawClone();

Warning in <TH1F::LabelsOption>: axis xaxis of Histogram hrootPlatform has extra following bins without labels. Sorting will work only for first label bins
Warning in <TH1F::LabelsOption>: axis xaxis of Histogram hShortRootPlatform has extra following bins without labels. Sorting will work only for first label bins