>gtable_add_rows</span>(<span class='no'>tab</span>, <span class='fu'><a href='http://www.rdocumentation.org/packages/grid/topics/unit'>unit</a></span>(<span class='fl'>1</span>, <span class='st'>"null"</span>), <span class='fl'>1</span>)
<span class='fu'>dim</span>(<span class='no'>tab2</span>)</div><div class='output co'>#&gt; [1] 4 3</div><div class='input'><span class='fu'>plot</span>(<span class='no'>tab2</span>)</div><div class='img'><img src='gtable_add_rows-2.png' alt='' width='700' height='433' /><