 </div>

    <pre class="usage"><span class='co'># S4 method for network</span>
<span class='fu'>gene_expr_simulation</span><span class='op'>(</span>
  <span class='va'>network</span>,
  time_label <span class='op'>=</span> <span class='fl'>1</span><span class='op'>:</span><span class='fl'>4</span>,
  subject <span class='op'>=</span> <span class='fl'>5</span>,
  peak_level <span class='op'>=</span> <span class='fl'>100</span>,
  act_time_group <span class='op'>=</span> <span class='fl'>1</span><span class=