2.1. Introduction

The DataServer module is the spine of the Uranie platform as it is where the data are stored, the attributes (name given to the variable in Uranie) are gathered and important basic mathematical operations are performed. Objects and methods will indeed need a TDataServer to retrieve, process and transmit the results of their own operations.

Since it is used by all other technical libraries (Sampler, Launcher, …), this library is the core library of Uranie (as shown in Figure 1.1). The already discussed TDataServer contains two main objects (has shown in Figure 2.1):

• the header: represented in Uranie by the object TDataSpecification. Different information related to the variables (called in “attributes” in Uranie language and represented by TAttribute objects) are specified in The TAttribute class.

• the data matrix: represented by the object TDSNtupleD (class derived from the ROOT class TTree). For an advanced use of this object, the reader can refer to chapter XII “Trees ROOT” in ROOT’s user manual.

Figure 2.1 Diagram of the class TDataServer

The chapter presentation will be articulated as follows. First of all, the way variable are handled will be introduced in The TAttribute class. This is a needed step, as all TDataServer have to be filled with attributes for being able to move along. The creation of a TDataServer (with many construction, from ASCII to ROOT files) is discussed in Data handling before discussing the basic statistical treatment (in Statistical treatments and operations) and the dedicated visualisation tool (in Visualisation dedicated to uncertainties).

Tip

An important point to know for the use of Uranie: all options are not case sensitive. Actually, the treatment of these options is taken anyway as lowercase. The following instructions are equivalent:

tdsGeyser.draw("x1","","Nclass=Sturges")
tdsGeyser.draw("x2","","nclass=Sturges")
tdsGeyser.draw("x2","","nclass=sturges")
tdsGeyser.draw("x2","","NCLASS=STURGES")