string">quiet</span>
    <span class="comment">% optimization variables</span>
    variable <span class="string">w(N-1)</span>     <span class="comment">% wire width</span>
    variable <span class="string">T(N)</span>       <span class="comment">% arrival time (Elmore delay to node i)</span>

    <span class="comment">% area definition</span>
    area = sum(w.*l);

    <span class="comment">% wire segment resistance is inversely proportional to widths</span>
    R = alpha.*l./w;
    R = [Rsource; R];

    