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<title>ATC: fix_modify AtC on_the_fly</title>
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<h1><a class="anchor" id="man_hardy_on_the_fly">fix_modify AtC on_the_fly </a></h1><h2><a class="anchor" id="syntax">
syntax</a></h2>
<p>fix_modify AtC on_the_fly &lt;bond | kernel&gt; &lt;optional on | off&gt; <br/>
- bond | kernel (keyword) = specifies on-the-fly calculation of bond or kernel matrix elements <br/>
</p>
<ul>
<li>on | off (keyword) = activate or discontinue on-the-fly mode <br/>
</li>
</ul>
<h2><a class="anchor" id="examples">
examples</a></h2>
<p><code> fix_modify AtC on_the_fly bond on </code> <br/>
<code> fix_modify AtC on_the_fly kernel </code> <br/>
<code> fix_modify AtC on_the_fly kernel off </code> <br/>
</p>
<h2><a class="anchor" id="description">
description</a></h2>
<p>Overrides normal mode of pre-calculating and storing bond pair-to-node a nd kernel atom-to-node matrices. If activated, will calculate elements of t hese matrices during repeated calls of field computations (i.e. "on-the-fly") and not store them for future use. <br/>
on flag is optional - if omitted, on_the_fly will be activated for the s pecified matrix. Can be deactivated using off flag. <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>By default, on-the-fly calculation is not active (i.e. off). However, code does a memory allocation check to determine if it can store all needed bond and kernel matrix ele ments. If this allocation fails, on-the-fly is activated. <br/>
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