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<li class="toctree-l1"><a class="reference internal" href="Run_head.html">4. Run LAMMPS</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Library.html">1. LAMMPS Library Interfaces</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Python_head.html">2. Use Python with LAMMPS</a></li>
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<li class="toctree-l1 current"><a class="reference internal" href="Modify.html">3. Modifying & extending LAMMPS</a><ul class="current">
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<li class="toctree-l2"><a class="reference internal" href="Modify_overview.html">3.1. Overview</a></li>
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<li class="toctree-l2"><a class="reference internal" href="Modify_contribute.html">3.2. Submitting new features for inclusion in LAMMPS</a></li>
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<li class="toctree-l2"><a class="reference internal" href="Modify_requirements.html">3.3. Requirements for contributions to LAMMPS</a></li>
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<li class="toctree-l2"><a class="reference internal" href="Modify_style.html">3.4. LAMMPS programming style</a></li>
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<li class="toctree-l2"><a class="reference internal" href="Modify_atom.html">3.5. Atom styles</a></li>
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<li class="toctree-l2"><a class="reference internal" href="Modify_pair.html">3.6. Pair styles</a></li>
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<li class="toctree-l2"><a class="reference internal" href="Modify_bond.html">3.7. Bond, angle, dihedral, improper styles</a></li>
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<li class="toctree-l2"><a class="reference internal" href="Modify_compute.html">3.8. Compute styles</a></li>
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<li class="toctree-l2"><a class="reference internal" href="Modify_fix.html">3.9. Fix styles</a></li>
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<li class="toctree-l2"><a class="reference internal" href="Modify_command.html">3.10. Input script command style</a></li>
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<li class="toctree-l2 current"><a class="current reference internal" href="#">3.11. Dump styles</a></li>
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<li class="toctree-l2"><a class="reference internal" href="Modify_kspace.html">3.12. Kspace styles</a></li>
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<li class="toctree-l2"><a class="reference internal" href="Modify_min.html">3.13. Minimization styles</a></li>
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<li class="toctree-l2"><a class="reference internal" href="Modify_region.html">3.14. Region styles</a></li>
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<li class="toctree-l2"><a class="reference internal" href="Modify_body.html">3.15. Body styles</a></li>
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<li class="toctree-l2"><a class="reference internal" href="Modify_gran_sub_mod.html">3.16. Granular Sub-Model styles</a></li>
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<li class="toctree-l2"><a class="reference internal" href="Modify_thermo.html">3.17. Thermodynamic output options</a></li>
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<li class="toctree-l2"><a class="reference internal" href="Modify_variable.html">3.18. Variable options</a></li>
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<li class="toctree-l1"><a class="reference internal" href="commands_list.html">Commands</a></li>
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<li class="toctree-l1"><a class="reference internal" href="fixes.html">Fix Styles</a></li>
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<li class="toctree-l1"><a class="reference internal" href="computes.html">Compute Styles</a></li>
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<li class="toctree-l1"><a class="reference internal" href="pairs.html">Pair Styles</a></li>
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<li class="toctree-l1"><a class="reference internal" href="bonds.html">Bond Styles</a></li>
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<li class="toctree-l1"><a class="reference internal" href="angles.html">Angle Styles</a></li>
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<li class="toctree-l1"><a class="reference internal" href="dihedrals.html">Dihedral Styles</a></li>
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<li class="toctree-l1"><a class="reference internal" href="impropers.html">Improper Styles</a></li>
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<li class="toctree-l1"><a class="reference internal" href="dumps.html">Dump Styles</a></li>
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<li class="toctree-l1"><a class="reference internal" href="fix_modify_atc_commands.html">fix_modify AtC commands</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Bibliography.html">Bibliography</a></li>
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<li class="breadcrumb-item active"><span class="section-number">3.11. </span>Dump styles</li>
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<p><span class="math notranslate nohighlight">\(\renewcommand{\AA}{\text{Å}}\)</span></p>
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<section id="dump-styles">
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<h1><span class="section-number">3.11. </span>Dump styles<a class="headerlink" href="#dump-styles" title="Link to this heading"></a></h1>
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<p>Classes that dump per-atom info to files are derived from the Dump
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class. To dump new quantities or in a new format, a new derived dump
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class can be added, but it is typically simpler to modify the
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DumpCustom class contained in the dump_custom.cpp file.</p>
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<p>Dump_atom.cpp is a simple example of a derived dump class.</p>
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<p>Here is a brief description of methods you define in your new derived
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class. See dump.h for details.</p>
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<table class="docutils align-default">
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<tbody>
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<tr class="row-odd"><td><p>write_header</p></td>
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<td><p>write the header section of a snapshot of atoms</p></td>
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</tr>
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<tr class="row-even"><td><p>count</p></td>
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<td><p>count the number of lines a processor will output</p></td>
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</tr>
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<tr class="row-odd"><td><p>pack</p></td>
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<td><p>pack a proc’s output data into a buffer</p></td>
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</tr>
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<tr class="row-even"><td><p>write_data</p></td>
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<td><p>write a proc’s data to a file</p></td>
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</tr>
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</tbody>
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</table>
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<p>See the <a class="reference internal" href="dump.html"><span class="doc">dump</span></a> command and its <em>custom</em> style for a list of
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keywords for atom information that can already be dumped by
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DumpCustom. It includes options to dump per-atom info from Compute
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classes, so adding a new derived Compute class is one way to calculate
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new quantities to dump.</p>
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<p>Note that new keywords for atom properties are not typically
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added to the <a class="reference internal" href="dump.html"><span class="doc">dump custom</span></a> command. Instead they are added
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to the <a class="reference internal" href="compute_property_atom.html"><span class="doc">compute property/atom</span></a> command.</p>
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