Jul 17, 2012 at 4:55 PM
Edited Jul 17, 2012 at 4:55 PM
I'm glad you've found NodeXL useful.
It's not quite accurate to say that Group by Cluster accounts only for vertices that have visible edges. The correct statement is that Group by Cluster accounts only for
vertices that are part of the graph. When you notice that the Group Vertices tab only includes 300 vertices, I bet it's because the graph has only 300 vertices. You can confirm this by going to NodeXL, Analysis, Graph Metrics; selecting
Overall Metrics in the Graph Metrics dialog box; and then looking at the Vertices count on the Overall Metrics worksheet.
So where did your missing vertices go? One possibility is that you are setting the Visibility of one or more edge rows to Skip, and that results in one or more vertices not being connected to any edges. In other words, those vertices become isolates.
NodeXL's default behavior is to skip vertices that are not connected to any edges, so they are not included in the graph and they cannot become part of a group.
Another possibility is that some vertices were isolates even before you changed any edge Visibilities. If you manually add a vertex to the Vertices worksheet and it is not included in any edges on the Edges worksheet--in other words, you add an isolate--you
have to set the Visibility of the vertex to Show to get it to become part of the graph. Again, the default behavior is to skip a vertex that is not connected to any edges. Setting the Visibility of the vertex to Show overrides this.
That leads me to the likely solution for the problem you are seeing. If you want all your vertices to remain in the graph even if they start out as isolates or become isolates as the result of skipping edges, then
set the Visibility of every vertex to Show.
At the risk of complicating things further, note that the Visibility options for both edges and vertices include "Hide." When you hide an edge or vertex, it is still part of the graph but just isn't visible in the graph pane. Hidden
vertices can be grouped.
Hovering over the Visibility column header on either worksheet will pop up an explanation of all the options.