A = abc_inc ( );
[ i, j ] = find ( A );
nodenames = {'Apton', 'Benton', 'Clinton'};
D = digraph ( i, j, [], nodenames );
plot ( D, 'arrowsize', 25, 'linewidth', 2, 'markersize', 15, 'nodefontsize', 16 );
print ( '-dpng', 'abc.png' );

A = abcd_inc ( );
[ i, j ] = find ( A );
nodenames = {'Apton', 'Benton', 'Clinton', 'Dayton' };
D = digraph ( i, j, [], nodenames );
plot ( D, 'arrowsize', 25, 'linewidth', 2, 'markersize', 15, 'nodefontsize', 16 );
print ( '-dpng', 'abcd.png' );
