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<title>ATC: fix_modify AtC rates</title>
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<h1><a class="anchor" id="man_hardy_rates">fix_modify AtC rates </a></h1><h2><a class="anchor" id="syntax">
syntax</a></h2>
<p>fix_modify AtC rates &lt;add | delete&gt; &lt;list_of_fields&gt; <br/>
</p>
<ul>
<li>add | delete (keyword) = add or delete the calculation of rates (time derivatives) for the listed output fields <br/>
</li>
<li>fields (keyword) = <br/>
rates can be calculated for all fields listed in <a class="el" href="man_hardy_fields.html">fix_modify AtC fields</a></li>
</ul>
<h2><a class="anchor" id="examples">
examples</a></h2>
<p><code> fix_modify AtC rates add temperature velocity stress </code> <br/>
<code> fix_modify AtC rates delete stress </code> <br/>
</p>
<h2><a class="anchor" id="description">
description</a></h2>
<p>Requests calculation and ouput of rates (time derivatives) of the fields from the transfer class. For eulerian analysis (see <a class="el" href="man_atom_element_map.html">fix_modify AtC atom_element_map</a> ), these rates are the partial time derivatives of the nodal fields, not the full (material) time derivatives. <br/>
</p>
<h2><a class="anchor" id="restrictions">
restrictions</a></h2>
<p>Must be used with the hardy/field type of AtC fix ( see <a class="el" href="man_fix_atc.html">fix atc command</a> ) </p>
<h2><a class="anchor" id="related">
related</a></h2>
<h2><a class="anchor" id="default">
default</a></h2>
<p>No rates are calculated by default </p>
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