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<title>partition command — LAMMPS 15 May 2015 version documentation</title>
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<div class="section" id="partition-command">
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<span id="index-0"></span><h1>partition command<a class="headerlink" href="#partition-command" title="Permalink to this headline">¶</a></h1>
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<div class="section" id="syntax">
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<h2>Syntax<a class="headerlink" href="#syntax" title="Permalink to this headline">¶</a></h2>
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<div class="highlight-python"><div class="highlight"><pre>partition style N command ...
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</pre></div>
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<ul class="simple">
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<li>style = <em>yes</em> or <em>no</em></li>
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<li>N = partition number (see asterisk form below)</li>
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<li>command = any LAMMPS command</li>
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</ul>
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<div class="section" id="examples">
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<h2>Examples<a class="headerlink" href="#examples" title="Permalink to this headline">¶</a></h2>
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<pre class="literal-block">
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partition yes 1 processors 4 10 6
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partition no 5 print "Active partition"
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partition yes <em>5 fix all nve
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partition yes 6</em> fix all nvt temp 1.0 1.0 0.1
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</pre>
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</div>
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<div class="section" id="description">
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<h2>Description<a class="headerlink" href="#description" title="Permalink to this headline">¶</a></h2>
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<p>This command invokes the specified command on a subset of the
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partitions of processors you have defined via the -partition
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command-line switch. See <a class="reference internal" href="Section_start.html#start-7"><span>Section_start 6</span></a>
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for an explanation of the switch.</p>
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<p>Normally, every input script command in your script is invoked by
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every partition. This behavior can be modified by defining world- or
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universe-style <a class="reference internal" href="variable.html"><em>variables</em></a> that have different values
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for each partition. This mechanism can be used to cause your script
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to jump to different input script files on different partitions, if
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such a variable is used in a <a class="reference internal" href="jump.html"><em>jump</em></a> command.</p>
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<p>The “partition” command is another mechanism for having as input
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script operate differently on different partitions. It is basically a
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prefix on any LAMMPS command. The commmand will only be invoked on
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the partition(s) specified by the <em>style</em> and <em>N</em> arguments.</p>
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<p>If the <em>style</em> is <em>yes</em>, the command will be invoked on any partition
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which matches the <em>N</em> argument. If the <em>style</em> is <em>no</em> the command
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will be invoked on all the partitions which do not match the Np
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argument.</p>
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<p>Partitions are numbered from 1 to Np, where Np is the number of
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partitions specified by the <a class="reference internal" href="Section_start.html#start-7"><span>-partition command-line switch</span></a>.</p>
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<p><em>N</em> can be specified in one of two ways. An explicit numeric value
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can be used, as in the 1st example above. Or a wild-card asterisk can
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be used to span a range of partition numbers. This takes the form “*”
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or “<em>n” or “n</em>” or “m*n”. An asterisk with no numeric values means
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all partitions from 1 to Np. A leading asterisk means all partitions
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from 1 to n (inclusive). A trailing asterisk means all partitions
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from n to Np (inclusive). A middle asterisk means all partitions from
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m to n (inclusive).</p>
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<p>This command can be useful for the “run_style verlet/split” command
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which imposed requirements on how the <a class="reference internal" href="processors.html"><em>processors</em></a>
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command lays out a 3d grid of processors in each of 2 partitions.</p>
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</div>
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<div class="section" id="restrictions">
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<h2>Restrictions<a class="headerlink" href="#restrictions" title="Permalink to this headline">¶</a></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<a class="headerlink" href="#related-commands" title="Permalink to this headline">¶</a></h2>
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<p><a class="reference internal" href="run_style.html"><em>run_style verlet/split</em></a></p>
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<p><strong>Default:</strong> none</p>
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