Athena Developer Guide

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Athena Chapter 19 Analysis utilities Version/Issue: 2.0.0 19.4 NAG C The NAG C library is a commercial mathematical library providing a similar functionality to the FORTRAN mathlib (part of CERNLIB). It is organised into chapters, each chapter devoted to a branch of numerical or statistical computation. A full list of the functions is available at http://wwwinfo.cern.ch/asd/lhc++/Nag_C/html/doc.html NAG C is not explicitly used in the Athena framework, but developers are encouraged to use it for mathematical computations. Instructions for linking NAG C with Athena can be found at http://cern.ch/lhcb-comp/Components/html/nagC.html Some NAG C functions print error messages to stdout by default, without any information about the calling algorithm and without filtering on severity level. A facility is provided by Athena to redirect these messages to the Athena MessageSvc. This is documented at http://cern.ch/lhcb-comp/Components/html/GaudiNagC.html 19.5 ROOT ROOT is used by Athena for I/O and as a persistency solution for event data, histograms and n-tuples. In addition, it can be used for interactive analysis, as discussed in Chapter 12. Information about ROOT can be found at http://root.cern.ch/ page 170
Athena Version/Issue: 2.0.0 Appendix A References [1] GAUDI User Guide http://lhcb-comp.web.cern.ch/lhcb-comp/Components/Gaudi_v6/gug.pdf [2] GAUDI - Architecture Design Report [LHCb 98-064 COMP] [3] HepMC Reference [4] Python Reference [5] StoreGate Design Document page 171
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