i <span class="op">=</span> <span class="cn">FALSE</span>,</span>
<span>  sample_list <span class="op">=</span> <span class="cn">NULL</span>,</span>
<span>  sample_names <span class="op">=</span> <span class="cn">NULL</span>,</span>
<span>  parallel <span class="op">=</span> <span class="cn">FALSE</span>,</span>
<span>  num_cores <span class="op">=</span> <span class="cn">NULL</span>,</span>
<span>  merge <span class="op">=</span> <span class="cn">FALSE</span>,</span>
<span>  <span class="va">...</span></sp