/div><div class='input'>
<span class='co'># But not when added to top (0) or bottom (-1, the default)</span>
<span class='no'>tab3</span> <span class='kw'>&lt;-</span> <span class='fu'>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='no'>tab3</span> <span class='kw'>&lt;-</span> <span class='fu'>gtable_add_rows</span>(<span class='no'>