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df029_SQlitePlatformDistribution.C File Reference

Detailed Description

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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 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();
}
The Canvas class.
Definition TCanvas.h:23
1-D histogram with a float per channel (see TH1 documentation)
Definition TH1.h:621
Basic string class.
Definition TString.h:139
Bool_t Contains(const char *pat, ECaseCompare cmp=kExact) const
Definition TString.h:632
RDataFrame FromSqlite(std::string_view fileName, std::string_view query)
Factory method to create a SQlite RDataFrame.
Date
August 2018
Author
Alexandra-Maria Dobrescu

Definition in file df029_SQlitePlatformDistribution.C.