Athena Developer Guide
Athena Developer Guide
Athena Developer Guide
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<strong>Athena</strong> Chapter 19 Analysis utilities Version/Issue: 2.0.0<br />
19.4 NAG C<br />
The NAG C library is a commercial mathematical library providing a similar functionality to the<br />
FORTRAN mathlib (part of CERNLIB). It is organised into chapters, each chapter devoted to a branch<br />
of numerical or statistical computation. A full list of the functions is available at<br />
http://wwwinfo.cern.ch/asd/lhc++/Nag_C/html/doc.html<br />
NAG C is not explicitly used in the <strong>Athena</strong> framework, but developers are encouraged to use it for<br />
mathematical computations. Instructions for linking NAG C with <strong>Athena</strong> can be found at<br />
http://cern.ch/lhcb-comp/Components/html/nagC.html<br />
Some NAG C functions print error messages to stdout by default, without any information about the<br />
calling algorithm and without filtering on severity level. A facility is provided by <strong>Athena</strong> to redirect<br />
these messages to the <strong>Athena</strong> MessageSvc. This is documented at<br />
http://cern.ch/lhcb-comp/Components/html/GaudiNagC.html<br />
19.5 ROOT<br />
ROOT is used by <strong>Athena</strong> for I/O and as a persistency solution for event data, histograms and n-tuples.<br />
In addition, it can be used for interactive analysis, as discussed in Chapter 12. Information about ROOT<br />
can be found at http://root.cern.ch/<br />
page 170
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