Athena Developer Guide
Athena Developer Guide
Athena Developer Guide
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<strong>Athena</strong> Chapter 11 Histogram facilities Version/Issue: 2.0.0<br />
Histograms<br />
IH is to gra m<br />
IHistogram1D<br />
IHistogram 2D<br />
TYPE<br />
1D<br />
GenHisto1D<br />
DataObject<br />
TYPE<br />
2D<br />
GenHisto2D<br />
1<br />
1<br />
1<br />
1<br />
IA x i s<br />
1<br />
TYPE1D<br />
1<br />
Axis<br />
2<br />
1<br />
TYPE2D<br />
H1D and H1DVar are currently<br />
the only two im plem ented<br />
specializations of G enH isto1D<br />
H1D<br />
H2D is currently the only one<br />
im plem ented specialization of<br />
GenHisto2D<br />
H2D<br />
H1DVar<br />
Figure 11.1 Histograms data model.<br />
11.2 The Histogram service.<br />
An instance of the histogram data service is created by the application manager. After the service has<br />
been initialised, the histogram data store will contain a root directory “/stat” in which users may<br />
book histograms and/or create sub-directories (for example, in the code fragment below, the histogram<br />
is stored in the subdirectory “/stat/simple“). A suggested naming convention for the<br />
sub-directories is given in Section 1.2.3.<br />
As discussed in Section 5.2, the Algorithm base class defines a member function<br />
IHistogramSvc* histoSvc()<br />
page 78
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