Graphics Reference
In-Depth Information
communities into which the graph will be resolved. A setting of 1.0 is a good
starting point, but return later to experiment with different values. Proceed
to run the algorithm, assigning each node to a community.
Using Color to Distinguish Clusters
You can use color to characterize clusters that are visible spatially—by
gender, for example, in this community of fans. You can also use it to more
clearly distinguish clusters that are not easy to see spatially (like the ones in
the middle of this graph), or when many of the nodes are filtered out.
To color clusters, you must first explicitly identify them. Now that each node
belongs to a community, labeled a
Modularity Class
in Gephi, you can
map it to color. In the Partition tab, assign Modularity Class to node color
and apply the change. If the option isn't in the list, click the refresh button
beside it.
The resulting plot shown in
Figure 11-9
illustrates that color is an effective
means of more easily distinguishing communities that do not have obvious
spatial boundaries. Note, however, that this is relatively weak visualization
thus far. Meaningful characterization of the communities being highlighted
has been sacrificed, and far more colors are in use than can be deciphered
by the partition legend. It is clear, however, where one community ends and
another begins, which will be useful when filters are applied to hide nodes
in the graph.
Find the Filters tab, and locate the Partition filters in the
Attributes
folder, as shown in
Figure 11-10
.
Drag the Sex filter into the Queries pane
below it. Check the “female” box and click the Filter button.
Return to the Preview pane to inspect the results. Now that fewer links are
showing, increase the edge opacity to 80 percent and the thickness to 3.0.
Takeadvantage oftheadditional whitespace toexpressmoreinformation by
turning on node labels. Labeling can be a bit finicky in Gephi, so you may
need to play with the settings a bit in both the Preview and Overview panes
until you get something satisfactory.
