.io/r/base/matrix.html" class="external-link">matrix</a></span><span class="op">(</span><span class="va">letters</span><span class="op">[</span><span class="fl">1</span><span class="op">:</span><span class="fl">26</span><span class="op">]</span>, ncol<span class="op">=</span><span class="fl">2</span><span class="op">)</span><span class="op">)</span></span></span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="co">### Make a nice 4 way display with two plots and two text summar