op">)</span></span></span>
<span class="r-in"><span>  <span class="va">u_x</span><span class="op">[</span><span class="va">u_x</span> <span class="op">!=</span> <span class="fl">0</span><span class="op">]</span></span></span>
<span class="r-in"><span><span class="op">}</span></span></span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="va">clusters_numbers</span> <span class="op">&lt;-</span> <span class="fu">no0_unique</span><span class="op">(</span><span class="va">clusters<