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<div class="section" id="fix-oneway-command">
<span id="index-0"></span><h1>fix oneway command<a class="headerlink" href="#fix-oneway-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>fix ID group-ID oneway N region-ID direction
</pre></div>
</div>
<ul class="simple">
<li>ID, group-ID are documented in <a class="reference internal" href="fix.html"><em>fix</em></a> command</li>
<li>oneway = style name of this fix command</li>
<li>N = apply this fix every this many timesteps</li>
<li>region-ID = ID of region where fix is active</li>
<li>direction = <em>x</em> or <em>-x</em> or <em>y</em> or <em>-y</em> or <em>z</em> or <em>-z</em> = coordinate and direction of the oneway constraint</li>
</ul>
</div>
<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>fix ions oneway 10 semi -x
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fix all oneway 1 left -z
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fix all oneway 1 right z
</pre></div>
</div>
</div>
<div class="section" id="description">
<h2>Description<a class="headerlink" href="#description" title="Permalink to this headline"></a></h2>
<p>Enforce that particles in the group and in a given region can only
move in one direction. This is done by reversing a particle&#8217;s
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velocity component, if it has the wrong sign in the specified
dimension. The effect is that the particle moves in one direction
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only.</p>
<p>This can be used, for example, as a simple model of a semi-permeable
membrane, or as an implementation of Maxwell&#8217;s demon.</p>
</div>
<hr class="docutils" />
<div class="section" id="restart-fix-modify-output-run-start-stop-minimize-info">
<h2>Restart, fix_modify, output, run start/stop, minimize info<a class="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 <a class="reference internal" href="restart.html"><em>binary restart files</em></a>. None of the <a class="reference internal" href="fix_modify.html"><em>fix_modify</em></a> options
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are relevant to this fix. No global or per-atom quantities are stored
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by this fix for access by various <a class="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 <a class="reference internal" href="run.html"><em>run</em></a> command.
This fix is not invoked during <a class="reference internal" href="minimize.html"><em>energy minimization</em></a>.</p>
</div>
<div class="section" id="restrictions">
<h2>Restrictions<a class="headerlink" href="#restrictions" title="Permalink to this headline"></a></h2>
<blockquote>
<div>none</div></blockquote>
</div>
<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_wall_reflect.html"><em>fix wall/reflect</em></a> command</p>
<p><strong>Default:</strong> none</p>
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