 of any number of industries in any number of countries
and years!</p>
</div>
<div class="section level3">
<h3 id="expand">Expand<a class="anchor" aria-label="anchor" href="#expand"></a>
</h3>
<p>Plotting values from a <code>matsindf</code> data frame can be
accomplished by <em>expand</em>ing the matrices of the
<code>matsindf</code> data frame (in this example, <code>Etas</code>)
back out to a tidy data frame. <em>Expand</em>ing is the reverse of
<em>collapse</em>-ing, and the following information must be