span class="va">flights.grp</span><span class="op">[[</span><span class="st">"wind_dir"</span><span class="op">]</span><span class="op">]</span><span class="op">)</span></span></code></pre></div>
<pre><code><span><span class="co">## [1] "colnames" "rownames"</span></span></code></pre>
<p>and the content of one attribute can be extracted with
<strong>h5attr</strong>, the content of all of them with a list as
<strong>h5attributes</strong>.</p>
<div class="sourceCode" id="cb26"><pre class="downlit sourceCode r