lass="op">(</span>fileext <span class="op">=</span> <span class="st">".h5"</span><span class="op">)</span></span>
<span><span class="va">file.h5</span> <span class="op">&lt;-</span> <span class="va"><a href="../reference/H5File-class.html">H5File</a></span><span class="op">$</span><span class="fu">new</span><span class="op">(</span><span class="va">test_filename</span>, mode <span class="op">=</span> <span class="st">"w"</span><span class="op">)</span></span>
<span><span class="va">file.h5</span></span></co