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<li><a class="reference internal" href="#">dimension command</a><ul>
<li><a class="reference internal" href="#syntax">Syntax</a></li>
<li><a class="reference internal" href="#examples">Examples</a></li>
<li><a class="reference internal" href="#description">Description</a></li>
<li><a class="reference internal" href="#restrictions">Restrictions</a></li>
<li><a class="reference internal" href="#related-commands">Related commands</a></li>
<li><a class="reference internal" href="#default">Default</a></li>
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<div class="section" id="dimension-command">
<span id="index-0"></span><h1>dimension command</h1>
<div class="section" id="syntax">
<h2>Syntax</h2>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">dimension</span> <span class="n">N</span>
</pre></div>
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<ul class="simple">
<li>N = 2 or 3</li>
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<h2>Examples</h2>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">dimension</span> <span class="mi">2</span>
</pre></div>
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</div>
<div class="section" id="description">
<h2>Description</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"><span class="doc">create_box</span></a> or <a class="reference internal" href="read_data.html"><span class="doc">read_data</span></a> commands.
Restart files also store this setting.</p>
<p>See the discussion in <a class="reference internal" href="Section_howto.html"><span class="doc">Section_howto</span></a> for
additional instructions on how to run 2d simulations.</p>
<div class="admonition note">
<p class="first admonition-title">Note</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</h2>
<p>This command must be used before the simulation box is defined by a
<a class="reference internal" href="read_data.html"><span class="doc">read_data</span></a> or <a class="reference internal" href="create_box.html"><span class="doc">create_box</span></a> command.</p>
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<div class="section" id="related-commands">
<h2>Related commands</h2>
<p><a class="reference internal" href="fix_enforce2d.html"><span class="doc">fix enforce2d</span></a></p>
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<div class="section" id="default">
<h2>Default</h2>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">dimension</span> <span class="mi">3</span>
</pre></div>
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