holding the result. For instance:</p><pre class="codeinput">t = lineage.subtree(19);
letterCount = t.treefun(@numel);
disp( [t.tostring letterCount.tostring ] ) <span class="comment">% Count the number of letters in each string of the t tree</span>
</pre><pre class="codeoutput">                EMS                         3         
     +-----------+-----+              +-----+--+      
     |                 |              |        |      
    MS                 E              2        1      
  +--+--+    