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<div class="section" id="compute-erotate-rigid-command">
<span id="index-0"></span><h1>compute erotate/rigid command</h1>
<div class="section" id="syntax">
<h2>Syntax</h2>
<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">erotate</span><span class="o">/</span><span class="n">rigid</span> <span class="n">fix</span><span class="o">-</span><span class="n">ID</span>
</pre></div>
</div>
<ul class="simple">
<li>ID, group-ID are documented in <a class="reference internal" href="compute.html"><span class="doc">compute</span></a> command</li>
<li>erotate/rigid = style name of this compute command</li>
<li>fix-ID = ID of rigid body fix</li>
</ul>
</div>
<div class="section" id="examples">
<h2>Examples</h2>
<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">erotate</span><span class="o">/</span><span class="n">rigid</span> <span class="n">myRigid</span>
</pre></div>
</div>
</div>
<div class="section" id="description">
<h2>Description</h2>
<p>Define a computation that calculates the rotational kinetic energy of
a collection of rigid bodies, as defined by one of the <a class="reference internal" href="fix_rigid.html"><span class="doc">fix rigid</span></a> command variants.</p>
<p>The rotational energy of each rigid body is computed as 1/2 I Wbody^2,
where I is the inertia tensor for the rigid body, and Wbody is its
angular velocity vector. Both I and Wbody are in the frame of
reference of the rigid body, i.e. I is diagonalized.</p>
<p>The <em>fix-ID</em> should be the ID of one of the <a class="reference internal" href="fix_rigid.html"><span class="doc">fix rigid</span></a>
commands which defines the rigid bodies. The group specified in the
compute command is ignored. The rotational energy of all the rigid
bodies defined by the fix rigid command in included in the
calculation.</p>
<p><strong>Output info:</strong></p>
<p>This compute calculates a global scalar (the summed rotational energy
of all the rigid bodies). This value can be used by any command that
uses a global scalar value from a compute as input. See
<a class="reference internal" href="Section_howto.html#howto-15"><span class="std std-ref">Section_howto 15</span></a> for an overview of
LAMMPS output options.</p>
<p>The scalar value calculated by this compute is &#8220;extensive&#8221;. The
scalar value will be in energy <a class="reference internal" href="units.html"><span class="doc">units</span></a>.</p>
</div>
<div class="section" id="restrictions">
<h2>Restrictions</h2>
<p>This compute is part of the RIGID package. It is only enabled if
LAMMPS was built with that package. See the <a class="reference internal" href="Section_start.html#start-3"><span class="std std-ref">Making LAMMPS</span></a> section for more info.</p>
</div>
<div class="section" id="related-commands">
<h2>Related commands</h2>
<p><span class="xref doc">compute ke/rigid</span></p>
<p><strong>Default:</strong> none</p>
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