an class="co">#&gt; attr(,"coltype")</span></span>
<span><span class="co">#&gt; [1] "Product"</span></span>
<span></span>
<span><span class="va">EnergyMats_2000</span><span class="op">$</span><span class="va">matrix</span><span class="op">[[</span><span class="fl">3</span><span class="op">]</span><span class="op">]</span> <span class="co"># The Y matrix</span></span>
<span><span class="co">#&gt;                Transport Residential</span></span>
<span><span class="co">#&gt; Diesel - Dist.     14750         