<span class="fl">20</span></span></span>
<span class="r-in"><span><span class="va">file</span><span class="op">[[</span><span class="st">"testgroup3/testset3"</span><span class="op">]</span><span class="op">]</span> <span class="op">&lt;-</span> <span class="fl">21</span><span class="op">:</span><span class="fl">30</span></span></span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="co"># Extract first 3 elements from each dataset and combine result to matrix</span></span></spa