Bookkeeping ...</span>
0129         <span class="comment">% Aggregation subsumes the higher index cluster into the lower.  Start by adding</span>
0130         <span class="comment">% (denormalized) interaction energies for the second (higher index) cluster</span>
0131         <span class="comment">% to those of the first and zeroing the old entries of the second.  Because of the</span>
0132         <span class="comment">% triangular structure of the connection matrix, repeat for both rows and columns ...</s