">matrix</span>(<span class="dv">1</span><span class="op">:</span><span class="dv">3</span>, <span class="dt">nrow =</span> <span class="dv">2</span>))</a>
<a class="sourceLine" id="cb15-10" title="10">res_matrix</a>
<a class="sourceLine" id="cb15-11" title="11"><span class="co">#&gt;                    call error</span></a>
<a class="sourceLine" id="cb15-12" title="12"><span class="co">#&gt; 1 matrix(1:3, nrow = 2)    NA</span></a>
<a class="sourceLine" id="cb15-13" title="13"><span class="co">#&gt;       