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<div class="section" id="fix-store-state-command">
<span id="index-0"></span><h1>fix store/state command</h1>
<div class="section" id="syntax">
<h2>Syntax</h2>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">fix</span> <span class="n">ID</span> <span class="n">group</span><span class="o">-</span><span class="n">ID</span> <span class="n">store</span><span class="o">/</span><span class="n">state</span> <span class="n">N</span> <span class="n">input1</span> <span class="n">input2</span> <span class="o">...</span> <span class="n">keyword</span> <span class="n">value</span> <span class="o">...</span>
</pre></div>
</div>
<ul class="simple">
<li>ID, group-ID are documented in <a class="reference internal" href="fix.html"><span class="doc">fix</span></a> command</li>
<li>store/state = style name of this fix command</li>
<li>N = store atom attributes every N steps, N = 0 for initial store only</li>
<li>input = one or more atom attributes</li>
</ul>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">possible</span> <span class="n">attributes</span> <span class="o">=</span> <span class="nb">id</span><span class="p">,</span> <span class="n">mol</span><span class="p">,</span> <span class="nb">type</span><span class="p">,</span> <span class="n">mass</span><span class="p">,</span>
<span class="n">x</span><span class="p">,</span> <span class="n">y</span><span class="p">,</span> <span class="n">z</span><span class="p">,</span> <span class="n">xs</span><span class="p">,</span> <span class="n">ys</span><span class="p">,</span> <span class="n">zs</span><span class="p">,</span> <span class="n">xu</span><span class="p">,</span> <span class="n">yu</span><span class="p">,</span> <span class="n">zu</span><span class="p">,</span> <span class="n">xsu</span><span class="p">,</span> <span class="n">ysu</span><span class="p">,</span> <span class="n">zsu</span><span class="p">,</span> <span class="n">ix</span><span class="p">,</span> <span class="n">iy</span><span class="p">,</span> <span class="n">iz</span><span class="p">,</span>
<span class="n">vx</span><span class="p">,</span> <span class="n">vy</span><span class="p">,</span> <span class="n">vz</span><span class="p">,</span> <span class="n">fx</span><span class="p">,</span> <span class="n">fy</span><span class="p">,</span> <span class="n">fz</span><span class="p">,</span>
<span class="n">q</span><span class="p">,</span> <span class="n">mux</span><span class="p">,</span> <span class="n">muy</span><span class="p">,</span> <span class="n">muz</span><span class="p">,</span> <span class="n">mu</span><span class="p">,</span>
<span class="n">radius</span><span class="p">,</span> <span class="n">diameter</span><span class="p">,</span> <span class="n">omegax</span><span class="p">,</span> <span class="n">omegay</span><span class="p">,</span> <span class="n">omegaz</span><span class="p">,</span>
<span class="n">angmomx</span><span class="p">,</span> <span class="n">angmomy</span><span class="p">,</span> <span class="n">angmomz</span><span class="p">,</span> <span class="n">tqx</span><span class="p">,</span> <span class="n">tqy</span><span class="p">,</span> <span class="n">tqz</span><span class="p">,</span>
<span class="n">c_ID</span><span class="p">,</span> <span class="n">c_ID</span><span class="p">[</span><span class="n">N</span><span class="p">],</span> <span class="n">f_ID</span><span class="p">,</span> <span class="n">f_ID</span><span class="p">[</span><span class="n">N</span><span class="p">],</span> <span class="n">v_name</span><span class="p">,</span>
<span class="n">d_name</span><span class="p">,</span> <span class="n">i_name</span>
</pre></div>
</div>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="nb">id</span> <span class="o">=</span> <span class="n">atom</span> <span class="n">ID</span>
<span class="n">mol</span> <span class="o">=</span> <span class="n">molecule</span> <span class="n">ID</span>
<span class="nb">type</span> <span class="o">=</span> <span class="n">atom</span> <span class="nb">type</span>
<span class="n">mass</span> <span class="o">=</span> <span class="n">atom</span> <span class="n">mass</span>
<span class="n">x</span><span class="p">,</span><span class="n">y</span><span class="p">,</span><span class="n">z</span> <span class="o">=</span> <span class="n">unscaled</span> <span class="n">atom</span> <span class="n">coordinates</span>
<span class="n">xs</span><span class="p">,</span><span class="n">ys</span><span class="p">,</span><span class="n">zs</span> <span class="o">=</span> <span class="n">scaled</span> <span class="n">atom</span> <span class="n">coordinates</span>
<span class="n">xu</span><span class="p">,</span><span class="n">yu</span><span class="p">,</span><span class="n">zu</span> <span class="o">=</span> <span class="n">unwrapped</span> <span class="n">atom</span> <span class="n">coordinates</span>
<span class="n">xsu</span><span class="p">,</span><span class="n">ysu</span><span class="p">,</span><span class="n">zsu</span> <span class="o">=</span> <span class="n">scaled</span> <span class="n">unwrapped</span> <span class="n">atom</span> <span class="n">coordinates</span>
<span class="n">ix</span><span class="p">,</span><span class="n">iy</span><span class="p">,</span><span class="n">iz</span> <span class="o">=</span> <span class="n">box</span> <span class="n">image</span> <span class="n">that</span> <span class="n">the</span> <span class="n">atom</span> <span class="ow">is</span> <span class="ow">in</span>
<span class="n">vx</span><span class="p">,</span><span class="n">vy</span><span class="p">,</span><span class="n">vz</span> <span class="o">=</span> <span class="n">atom</span> <span class="n">velocities</span>
<span class="n">fx</span><span class="p">,</span><span class="n">fy</span><span class="p">,</span><span class="n">fz</span> <span class="o">=</span> <span class="n">forces</span> <span class="n">on</span> <span class="n">atoms</span>
<span class="n">q</span> <span class="o">=</span> <span class="n">atom</span> <span class="n">charge</span>
<span class="n">mux</span><span class="p">,</span><span class="n">muy</span><span class="p">,</span><span class="n">muz</span> <span class="o">=</span> <span class="n">orientation</span> <span class="n">of</span> <span class="n">dipolar</span> <span class="n">atom</span>
<span class="n">mu</span> <span class="o">=</span> <span class="n">magnitued</span> <span class="n">of</span> <span class="n">dipole</span> <span class="n">moment</span> <span class="n">of</span> <span class="n">atom</span>
<span class="n">radius</span><span class="p">,</span><span class="n">diameter</span> <span class="o">=</span> <span class="n">radius</span><span class="o">.</span><span class="n">diameter</span> <span class="n">of</span> <span class="n">spherical</span> <span class="n">particle</span>
<span class="n">omegax</span><span class="p">,</span><span class="n">omegay</span><span class="p">,</span><span class="n">omegaz</span> <span class="o">=</span> <span class="n">angular</span> <span class="n">velocity</span> <span class="n">of</span> <span class="n">spherical</span> <span class="n">particle</span>
<span class="n">angmomx</span><span class="p">,</span><span class="n">angmomy</span><span class="p">,</span><span class="n">angmomz</span> <span class="o">=</span> <span class="n">angular</span> <span class="n">momentum</span> <span class="n">of</span> <span class="n">aspherical</span> <span class="n">particle</span>
<span class="n">tqx</span><span class="p">,</span><span class="n">tqy</span><span class="p">,</span><span class="n">tqz</span> <span class="o">=</span> <span class="n">torque</span> <span class="n">on</span> <span class="n">finite</span><span class="o">-</span><span class="n">size</span> <span class="n">particles</span>
<span class="n">c_ID</span> <span class="o">=</span> <span class="n">per</span><span class="o">-</span><span class="n">atom</span> <span class="n">vector</span> <span class="n">calculated</span> <span class="n">by</span> <span class="n">a</span> <span class="n">compute</span> <span class="k">with</span> <span class="n">ID</span>
<span class="n">c_ID</span><span class="p">[</span><span class="n">I</span><span class="p">]</span> <span class="o">=</span> <span class="n">Ith</span> <span class="n">column</span> <span class="n">of</span> <span class="n">per</span><span class="o">-</span><span class="n">atom</span> <span class="n">array</span> <span class="n">calculated</span> <span class="n">by</span> <span class="n">a</span> <span class="n">compute</span> <span class="k">with</span> <span class="n">ID</span>
<span class="n">f_ID</span> <span class="o">=</span> <span class="n">per</span><span class="o">-</span><span class="n">atom</span> <span class="n">vector</span> <span class="n">calculated</span> <span class="n">by</span> <span class="n">a</span> <span class="n">fix</span> <span class="k">with</span> <span class="n">ID</span>
<span class="n">f_ID</span><span class="p">[</span><span class="n">I</span><span class="p">]</span> <span class="o">=</span> <span class="n">Ith</span> <span class="n">column</span> <span class="n">of</span> <span class="n">per</span><span class="o">-</span><span class="n">atom</span> <span class="n">array</span> <span class="n">calculated</span> <span class="n">by</span> <span class="n">a</span> <span class="n">fix</span> <span class="k">with</span> <span class="n">ID</span>
<span class="n">v_name</span> <span class="o">=</span> <span class="n">per</span><span class="o">-</span><span class="n">atom</span> <span class="n">vector</span> <span class="n">calculated</span> <span class="n">by</span> <span class="n">an</span> <span class="n">atom</span><span class="o">-</span><span class="n">style</span> <span class="n">variable</span> <span class="k">with</span> <span class="n">name</span>
<span class="n">d_name</span> <span class="o">=</span> <span class="n">per</span><span class="o">-</span><span class="n">atom</span> <span class="n">floating</span> <span class="n">point</span> <span class="n">vector</span> <span class="n">name</span><span class="p">,</span> <span class="n">managed</span> <span class="n">by</span> <span class="n">fix</span> <span class="nb">property</span><span class="o">/</span><span class="n">atom</span>
<span class="n">i_name</span> <span class="o">=</span> <span class="n">per</span><span class="o">-</span><span class="n">atom</span> <span class="n">integer</span> <span class="n">vector</span> <span class="n">name</span><span class="p">,</span> <span class="n">managed</span> <span class="n">by</span> <span class="n">fix</span> <span class="nb">property</span><span class="o">/</span><span class="n">atom</span>
</pre></div>
</div>
<ul class="simple">
<li>zero or more keyword/value pairs may be appended</li>
<li>keyword = <em>com</em></li>
</ul>
<pre class="literal-block">
<em>com</em> value = <em>yes</em> or <em>no</em>
</pre>
</div>
<div class="section" id="examples">
<h2>Examples</h2>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">fix</span> <span class="mi">1</span> <span class="nb">all</span> <span class="n">store</span><span class="o">/</span><span class="n">state</span> <span class="mi">0</span> <span class="n">x</span> <span class="n">y</span> <span class="n">z</span>
<span class="n">fix</span> <span class="mi">1</span> <span class="nb">all</span> <span class="n">store</span><span class="o">/</span><span class="n">state</span> <span class="mi">0</span> <span class="n">xu</span> <span class="n">yu</span> <span class="n">zu</span> <span class="n">com</span> <span class="n">yes</span>
<span class="n">fix</span> <span class="mi">2</span> <span class="nb">all</span> <span class="n">store</span><span class="o">/</span><span class="n">state</span> <span class="mi">1000</span> <span class="n">vx</span> <span class="n">vy</span> <span class="n">vz</span>
</pre></div>
</div>
</div>
<div class="section" id="description">
<h2>Description</h2>
<p>Define a fix that stores attributes for each atom in the group at the
time the fix is defined. If <em>N</em> is 0, then the values are never
updated, so this is a way of archiving an atom attribute at a given
time for future use in a calculation or output. See the discussion of
<a class="reference internal" href="Section_howto.html#howto-15"><span class="std std-ref">output commands</span></a> that take fixes as
inputs.</p>
<p>If <em>N</em> is not zero, then the attributes will be updated every <em>N</em>
steps.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">Actually, only atom attributes specified by keywords like <em>xu</em>
or <em>vy</em> or <em>radius</em> are initially stored immediately at the point in
your input script when the fix is defined. Attributes specified by a
compute, fix, or variable are not initially stored until the first run
following the fix definition begins. This is because calculating
those attributes may require quantities that are not defined in
between runs.</p>
</div>
<p>The list of possible attributes is the same as that used by the <a class="reference internal" href="dump.html"><span class="doc">dump custom</span></a> command, which describes their meaning.</p>
<p>If the <em>com</em> keyword is set to <em>yes</em> then the <em>xu</em>, <em>yu</em>, and <em>zu</em>
inputs store the position of each atom relative to the center-of-mass
of the group of atoms, instead of storing the absolute position.</p>
<p>The requested values are stored in a per-atom vector or array as
discussed below. Zeroes are stored for atoms not in the specified
group.</p>
</div>
<div class="section" id="restart-fix-modify-output-run-start-stop-minimize-info">
<h2>Restart, fix_modify, output, run start/stop, minimize info</h2>
<p>This fix writes the per-atom values it stores to <a class="reference internal" href="restart.html"><span class="doc">binary restart files</span></a>, so that the values can be restored when a
simulation is restarted. See the <a class="reference internal" href="read_restart.html"><span class="doc">read_restart</span></a>
command for info on how to re-specify a fix in an input script that
reads a restart file, so that the operation of the fix continues in an
uninterrupted fashion.</p>
<p>None of the <a class="reference internal" href="fix_modify.html"><span class="doc">fix_modify</span></a> options are relevant to this
fix.</p>
<p>If a single input is specified, this fix produces a per-atom vector.
If multiple inputs are specified, a per-atom array is produced where
the number of columns for each atom is the number of inputs. These
can be accessed by various <a class="reference internal" href="Section_howto.html#howto-15"><span class="std std-ref">output commands</span></a>. The per-atom values be
accessed on any timestep.</p>
<p>No parameter of this fix can be used with the <em>start/stop</em> keywords of
the <a class="reference internal" href="run.html"><span class="doc">run</span></a> command. This fix is not invoked during <a class="reference internal" href="minimize.html"><span class="doc">energy minimization</span></a>.</p>
</div>
<div class="section" id="restrictions">
<h2>Restrictions</h2>
<blockquote>
<div>none</div></blockquote>
</div>
<div class="section" id="related-commands">
<h2>Related commands</h2>
<p><a class="reference internal" href="dump.html"><span class="doc">dump custom</span></a>, <a class="reference internal" href="compute_property_atom.html"><span class="doc">compute property/atom</span></a>,
<a class="reference internal" href="fix_property_atom.html"><span class="doc">fix property/atom</span></a>, <a class="reference internal" href="variable.html"><span class="doc">variable</span></a></p>
</div>
<div class="section" id="default">
<h2>Default</h2>
<p>The option default is com = no.</p>
</div>
</div>
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