Athena Developer Guide

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<strong>Athena</strong> Chapter 12 N-tuple and Event Collection facilities Version/Issue: 2.0.0 • Items are the equivalent of numbers: bool, long, float. • Array are equivalent to 1 dimensional arrays: bool[size], long[size], float[size] • Matrix are equivalent to an array of arrays or matrix: bool[dim1][dim2]. There is no implicit bounds checking possible without a rather big overhead at run-time. Hence it is up to the user to ensure the arrays do not overflow. When all entries are filled, the row must be committed, i.e. the record of the n-tuple must be written. Listing 12.3 Filling an n-tuple. 1: m_ntrk = 0; 2: for( MyTrackVector::iterator i = mytracks->begin(); i != mytracks->end(); i++ ) { 3: const HepLorentzVector& mom4 = (*i)->fourMomentum(); 4: m_px[m_ntrk] = mom4.px(); 5: m_py[m_ntrk] = mom4.py(); 6: m_pz[m_ntrk] = mom4.pz(); 7: m_index[m_ntrk] = cnt; 8: m_flag[m_ntrk] = (m_ntrk%2 == 0) ? true : false; 9: m_hits[m_ntrk][0] = 0; 10: m_hits[m_ntrk][1] = 1; 11: m_ntrk++; 12: // Make sure the array(s) do not overflow. 13: if ( m_ntrk > m_ntrk->range().distance() ) break; 14: } 15: // Commit N tuple row. 16: status = ntupleSvc()->writeRecord("/NTUPLES/FILE1/MC/1"); 17: if ( !status.isSuccess() ) { 18: log
<strong>Athena</strong> Chapter 12 N-tuple and Event Collection facilities Version/Issue: 2.0.0 Listing 12.4 Reading an n-tuple. 1: NTuplePtr nt(ntupleSvc(), "/NTUPLES/FILE1/ROW_WISE/2"); 2: if ( nt ) { 3: long count = 0; 4: NTuple::Item px, py, pz; 5: status = nt->item("px", px); 6: status = nt->item("py", py); 7: status = nt->item("pz", pz); 8: nt->attachSelector(new SelectStatement("pz>0 And px>0")); 9: // Access the N tuple row by row and print the first 10 tracks 10: while ( ntupleSvc()->readRecord(nt.ptr()).isSuccess() ) { 11: log
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ATLAS Athena The ATLAS Common Frame
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Athena Table of Contents Version/Is
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Athena Chapter 1 Introduction Versi
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Athena Chapter 2 The framework arch
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Athena Chapter 3 Release notes Vers
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Athena Chapter 4 Establishing a dev
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Athena Chapter 5 Writing algorithms
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Athena Chapter 15 Converters Versio
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Athena Chapter 19 Analysis utilitie
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Athena Version/Issue: 2.0.0 Appendi
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Athena Developer Guide

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