<spanid="index-0"></span><h1>fix nve/eff command<aclass="headerlink"href="#fix-nve-eff-command"title="Permalink to this headline">¶</a></h1>
<divclass="section"id="syntax">
<h2>Syntax<aclass="headerlink"href="#syntax"title="Permalink to this headline">¶</a></h2>
<divclass="highlight-python"><divclass="highlight"><pre>fix ID group-ID nve/eff
</pre></div>
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<ulclass="simple">
<li>ID, group-ID are documented in <aclass="reference internal"href="fix.html"><em>fix</em></a> command</li>
<li>nve/eff = style name of this fix command</li>
</ul>
</div>
<divclass="section"id="examples">
<h2>Examples<aclass="headerlink"href="#examples"title="Permalink to this headline">¶</a></h2>
<divclass="highlight-python"><divclass="highlight"><pre>fix 1 all nve/eff
</pre></div>
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<divclass="section"id="description">
<h2>Description<aclass="headerlink"href="#description"title="Permalink to this headline">¶</a></h2>
<p>Perform constant NVE integration to update position and velocity for
nuclei and electrons in the group for the <aclass="reference internal"href="pair_eff.html"><em>electron force field</em></a> model. V is volume; E is energy. This creates a
system trajectory consistent with the microcanonical ensemble.</p>
<p>The operation of this fix is exactly like that described by the <aclass="reference internal"href="fix_nve.html"><em>fix nve</em></a> command, except that the radius and radial velocity
<h2>Restart, fix_modify, output, run start/stop, minimize info<aclass="headerlink"href="#restart-fix-modify-output-run-start-stop-minimize-info"title="Permalink to this headline">¶</a></h2>
<p>No information about this fix is written to <aclass="reference internal"href="restart.html"><em>binary restart files</em></a>. None of the <aclass="reference internal"href="fix_modify.html"><em>fix_modify</em></a> options
are relevant to this fix. No global or per-atom quantities are stored
by this fix for access by various <aclass="reference internal"href="Section_howto.html#howto-15"><span>output commands</span></a>. No parameter of this fix can
be used with the <em>start/stop</em> keywords of the <aclass="reference internal"href="run.html"><em>run</em></a> command.
This fix is not invoked during <aclass="reference internal"href="minimize.html"><em>energy minimization</em></a>.</p>
</div>
<divclass="section"id="restrictions">
<h2>Restrictions<aclass="headerlink"href="#restrictions"title="Permalink to this headline">¶</a></h2>
<p>This fix is part of the USER-EFF package. It is only enabled if
LAMMPS was built with that package. See the <aclass="reference internal"href="Section_start.html#start-3"><span>Making LAMMPS</span></a> section for more info.</p>
</div>
<divclass="section"id="related-commands">
<h2>Related commands<aclass="headerlink"href="#related-commands"title="Permalink to this headline">¶</a></h2>
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