Graphics Reference
In-Depth Information
in a movie. If you extract the ego network for Leonardo DiCaprio from this
data set, with the first level including movies and the second level including
co-stars, you get a graph as shown in
Figure 9-13
.
This is called a
bipartite graph
, or
bigraph
. It is called bipartite because
it's made up of two kinds of nodes that are never directly connected. In this
case, you have actors connected to movies, and movies connected to actors.
You must go through one to get to the other.
Figure 9-13:
This version of the graph shows all of DiCaprio's movies and
co-stars.
This movie and actor data appears much cleaner and more informative
when presented as a bigraph, as opposed to the two graphs shown in
Figure
9-11
and
Figure 9-12
.
The two connections of John C. Reilly to DiCaprio are
clearly visible (via
What's Eating Gilbert Grape
and
The Aviator
). What's
missing are all the connections between actors through non-DiCaprio
movies. Also, the movies that actors share in common are explicitly
