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<li class="toctree-l1"><a class="reference internal" href="Section_intro.html">1. Introduction</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Section_accelerate.html">5. Accelerating LAMMPS performance</a></li>
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<div class="section" id="compute-body-local-command">
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<span id="index-0"></span><h1>compute body/local command</h1>
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<div class="section" id="syntax">
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<h2>Syntax</h2>
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<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">compute</span> <span class="n">ID</span> <span class="n">group</span><span class="o">-</span><span class="n">ID</span> <span class="n">body</span><span class="o">/</span><span class="n">local</span> <span class="n">input1</span> <span class="n">input2</span> <span class="o">...</span>
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</pre></div>
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</div>
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<ul class="simple">
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<li>ID, group-ID are documented in <a class="reference internal" href="compute.html"><span class="doc">compute</span></a> command</li>
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<li>body/local = style name of this compute command</li>
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<li>one or more keywords may be appended</li>
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<li>keyword = <em>id</em> or <em>type</em> or <em>integer</em></li>
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</ul>
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<pre class="literal-block">
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<em>id</em> = atom ID of the body particle
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<em>type</em> = atom type of the body particle
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<em>integer</em> = 1,2,3,etc = index of fields defined by body style
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</pre>
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</div>
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<div class="section" id="examples">
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<h2>Examples</h2>
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<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">compute</span> <span class="mi">1</span> <span class="nb">all</span> <span class="n">body</span><span class="o">/</span><span class="n">local</span> <span class="nb">type</span> <span class="mi">1</span> <span class="mi">2</span> <span class="mi">3</span>
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<span class="n">compute</span> <span class="mi">1</span> <span class="nb">all</span> <span class="n">body</span><span class="o">/</span><span class="n">local</span> <span class="mi">3</span> <span class="mi">6</span>
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</pre></div>
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</div>
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</div>
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<div class="section" id="description">
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<h2>Description</h2>
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<p>Define a computation that calculates properties of individual body
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sub-particles. The number of datums generated, aggregated across all
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processors, equals the number of body sub-particles plus the number of
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non-body particles in the system, modified by the group parameter as
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explained below. See <a class="reference internal" href="Section_howto.html#howto-14"><span class="std std-ref">Section_howto 14</span></a>
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of the manual and the <a class="reference internal" href="body.html"><span class="doc">body</span></a> doc page for more details on
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using body particles.</p>
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<p>The local data stored by this command is generated by looping over all
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the atoms. An atom will only be included if it is in the group. If
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the atom is a body particle, then its N sub-particles will be looped
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over, and it will contribute N datums to the count of datums. If it
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is not a body particle, it will contribute 1 datum.</p>
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<p>For both body particles and non-body particles, the <em>id</em> keyword
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will store the ID of the particle.</p>
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<p>For both body particles and non-body particles, the <em>type</em> keyword
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will store the type of the particle.</p>
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<p>The <em>integer</em> keywords mean different things for body and non-body
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particles. If the atom is not a body particle, only its <em>x</em>, <em>y</em>, <em>z</em>
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coordinates can be referenced, using the <em>integer</em> keywords 1,2,3.
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Note that this means that if you want to access more fields than this
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for body particles, then you cannot include non-body particles in the
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group.</p>
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<p>For a body particle, the <em>integer</em> keywords refer to fields calculated
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by the body style for each sub-particle. The body style, as specified
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by the <a class="reference internal" href="atom_style.html"><span class="doc">atom_style body</span></a>, determines how many fields
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exist and what they are. See the <a class="reference internal" href="body.html"><span class="doc">body</span></a> doc page for
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details of the different styles.</p>
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<p>Here is an example of how to output body information using the <a class="reference internal" href="dump.html"><span class="doc">dump local</span></a> command with this compute. If fields 1,2,3 for the
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body sub-particles are x,y,z coordinates, then the dump file will be
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formatted similar to the output of a <a class="reference internal" href="dump.html"><span class="doc">dump atom or custom</span></a>
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command.</p>
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<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">compute</span> <span class="mi">1</span> <span class="nb">all</span> <span class="n">body</span><span class="o">/</span><span class="n">local</span> <span class="nb">type</span> <span class="mi">1</span> <span class="mi">2</span> <span class="mi">3</span>
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<span class="n">dump</span> <span class="mi">1</span> <span class="nb">all</span> <span class="n">local</span> <span class="mi">1000</span> <span class="n">tmp</span><span class="o">.</span><span class="n">dump</span> <span class="n">index</span> <span class="n">c_1</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span> <span class="n">c_1</span><span class="p">[</span><span class="mi">2</span><span class="p">]</span> <span class="n">c_1</span><span class="p">[</span><span class="mi">3</span><span class="p">]</span> <span class="n">c_1</span><span class="p">[</span><span class="mi">4</span><span class="p">]</span>
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</pre></div>
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</div>
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<p><strong>Output info:</strong></p>
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<p>This compute calculates a local vector or local array depending on the
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number of keywords. The length of the vector or number of rows in the
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array is the number of datums as described above. If a single keyword
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is specified, a local vector is produced. If two or more keywords are
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specified, a local array is produced where the number of columns = the
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number of keywords. The vector or array can be accessed by any
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command that uses local values from a compute as input. See <a class="reference internal" href="Section_howto.html#howto-15"><span class="std std-ref">this section</span></a> for an overview of LAMMPS output
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options.</p>
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<p>The <a class="reference internal" href="units.html"><span class="doc">units</span></a> for output values depend on the body style.</p>
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</div>
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<div class="section" id="restrictions">
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<h2>Restrictions</h2>
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<blockquote>
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<div>none</div></blockquote>
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</div>
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<div class="section" id="related-commands">
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<h2>Related commands</h2>
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<p><a class="reference internal" href="dump.html"><span class="doc">dump local</span></a></p>
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<p><strong>Default:</strong> none</p>
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