2.3.2. Import data from an ASCII file

An example of import of the data file "geyser.dat" (available in the Uranie-macros folder) is shown below leading to a 2D scatterplot of the variable x2 versus the variable x1

    using namespace URANIE::DataServer; // (1)

    TDataServer * tdsGeyser = new TDataServer("tdsgeyser", "Geyser database"); // (2)
    tdsGeyser->fileDataRead("geyser.dat"); // (3)
    tdsGeyser->draw("x2:x1"); // (4)

Description of the import of an ASCII file

1. Setting the namespace. This instruction is useless when the provided rootlogon has been loaded as all Uranie-namespaces have been loaded as well.

2. Defining a pointer tdsGeyser to an object of type TDataServer whose name is “tdsgeyser” and whose title is “Geyser database”. These information are used by the export or printLog methods.

3. Loading data contained in an ASCII file $URANIESYS/share/uranie/macros/geyser.dat.

4. Plot of the scatterplot of the variable x2 versus the variable x1

The obtained graph is the following:

Figure 2.36 Import data from an ASCII file

Various examples of macros loading data in a TDataServer with different treatment applied on, are provided in the use-case chapter of this user manual, between Macro “dataserverLoadASCIIFilePasture.C” and Macro “dataserverLoadASCIIFileCornell.C”.

Summary: Loading data ( ASCII file )

• fileDataRead ( TString filename, bool saveTuple=true, bool preAddReload=false)

  Loads the data contained in the ASCII file (“Salome-table” format). The possible arguments are:

  • The name of the file (compulsory)

  • A boolean to state whether the file should be saved as root-ntuple once the reading is complete (not mandatory, set to true by default)

  • A boolean to allow pre-adding or reloading a database (advanced, not recommended for beginners). This allows

    • Pre-adding variables: very technical. It should not be used unless discussed with developers.

    • Reloading database: Allow to reload a database file without complaining, AS long AS the provided file exactly matches the list of attribute in the TDataServer object

• fileDataReadJSon ( TString filename, bool saveTuple=true)

  Loads the data contained in the ASCII file (JSON format). The possible arguments are:

  • The name of the file (compulsory)

  • A boolean to state whether the file should be saved as root-ntuple once the reading is complete (not mandatory, set to true by default)