 0.3975155</span></span>
<span><span class="co">#&gt; attr(,"rowtype")</span></span>
<span><span class="co">#&gt; [1] "Industry"</span></span>
<span><span class="co">#&gt; attr(,"coltype")</span></span>
<span><span class="co">#&gt; [1] "Efficiency"</span></span></code></pre></div>
<p>Note that only a few lines of code are required to perform the same
series of matrix operations on every combination of <code>Country</code>
and <code>Year</code>. In fact, the same code will be used to calculate
the efficiency