p><pre class="codeinput">cc = scomponents(A)
</pre><pre class="codeoutput">
cc =

     2
     2
     2
     1
     2
     2
     3
     3
     3

</pre><p>The output tells us that vertices 1,2,3,5,6 are in one strong component, vertex 4 is it's own strong component, and vertices
            7,8,9 are in another one.  Remember that a strong component is all the vertices mutually reachable from a given vertex.  If
            you start at vertex 4, you can't get anywhere else!  That's why it is in a different