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<title>ATC: fix_modify AtC gradients</title>
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<h1><a class="anchor" id="man_hardy_gradients">fix_modify AtC gradients </a></h1><h2><a class="anchor" id="syntax">
syntax</a></h2>
<p>fix_modify AtC gradients &lt;add | delete&gt; &lt;list_of_fields&gt; <br/>
</p>
<ul>
<li>add | delete (keyword) = add or delete the calculation of gradients for the listed output fields <br/>
</li>
<li>fields (keyword) = <br/>
gradients 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 gradients add temperature velocity stress </code> <br/>
<code> fix_modify AtC gradients delete velocity </code> <br/>
</p>
<h2><a class="anchor" id="description">
description</a></h2>
<p>Requests calculation and ouput of gradients of the fields from the transfer class. These gradients will be with regard to spatial or material coordinate for eulerian or lagrangian analysis, respectively, as specified by atom_element_map (see <a class="el" href="man_atom_element_map.html">fix_modify AtC atom_element_map</a> ) </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 gradients are calculated by default </p>
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