E</span>, units <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/c.html" class="external-link">c</a></span><span class="op">(</span><span class="st">"index"</span>, <span class="st">"mm"</span><span class="op">)</span><span class="op">)</span></span></code></pre></div>
    </div>

    <div id="arguments">
    <h2>Arguments</h2>
    <dl><dt>img</dt>
<dd><p>Object of class <code>nifti</code></p></dd>


<dt>mask</dt>
<dd><p>Mask to be applied for indices the index</p></dd>


<dt>add_v