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<div class="section" id="dimension-command">
<span id="index-0"></span><h1>dimension command<a class="headerlink" href="#dimension-command" title="Permalink to this headline"></a></h1>
<div class="section" id="syntax">
<h2>Syntax<a class="headerlink" href="#syntax" title="Permalink to this headline"></a></h2>
<div class="highlight-python"><div class="highlight"><pre>dimension N
</pre></div>
</div>
<ul class="simple">
<li>N = 2 or 3</li>
</ul>
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<div class="section" id="examples">
<h2>Examples<a class="headerlink" href="#examples" title="Permalink to this headline"></a></h2>
<div class="highlight-python"><div class="highlight"><pre>dimension 2
</pre></div>
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<div class="section" id="description">
<h2>Description<a class="headerlink" href="#description" title="Permalink to this headline"></a></h2>
<p>Set the dimensionality of the simulation. By default LAMMPS runs 3d
simulations. To run a 2d simulation, this command should be used
prior to setting up a simulation box via the
<a class="reference internal" href="create_box.html"><em>create_box</em></a> or <a class="reference internal" href="read_data.html"><em>read_data</em></a> commands.
Restart files also store this setting.</p>
<p>See the discussion in <a class="reference internal" href="Section_howto.html"><em>Section_howto</em></a> for
additional instructions on how to run 2d simulations.</p>
<div class="admonition warning">
<p class="first admonition-title">Warning</p>
<p class="last">Some models in LAMMPS treat particles as finite-size
spheres or ellipsoids, as opposed to point particles. In 2d, the
particles will still be spheres or ellipsoids, not circular disks or
ellipses, meaning their moment of inertia will be the same as in 3d.</p>
</div>
</div>
<div class="section" id="restrictions">
<h2>Restrictions<a class="headerlink" href="#restrictions" title="Permalink to this headline"></a></h2>
<p>This command must be used before the simulation box is defined by a
<a class="reference internal" href="read_data.html"><em>read_data</em></a> or <a class="reference internal" href="create_box.html"><em>create_box</em></a> command.</p>
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<div class="section" id="related-commands">
<h2>Related commands<a class="headerlink" href="#related-commands" title="Permalink to this headline"></a></h2>
<p><a class="reference internal" href="fix_enforce2d.html"><em>fix enforce2d</em></a></p>
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<div class="section" id="default">
<h2>Default<a class="headerlink" href="#default" title="Permalink to this headline"></a></h2>
<div class="highlight-python"><div class="highlight"><pre>dimension 3
</pre></div>
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