df029_SQlitePlatformDistribution.C File Reference

Detailed Description

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.

 
void df029_SQlitePlatformDistribution() {
 
   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 c1 = new TCanvas();
   c1->SetLogy(1);
   hRootPlatform.GetXaxis()->LabelsOption("a");
   hRootPlatform.LabelsDeflate("X");
   hRootPlatform.DrawClone();
 
   auto c2 = new TCanvas();
   hShortRootPlatform.GetXaxis()->LabelsOption("a");
   hShortRootPlatform.LabelsDeflate("X");
   hShortRootPlatform.DrawClone();
}

Date

August 2018

Author

Alexandra-Maria Dobrescu

Definition in file df029_SQlitePlatformDistribution.C.