Creating Groups by Connected Component
A connected component is a set of vertices (and their incident edges) that are connected to each other but not to the rest of the graph.
To remove any existing groups, create a group for each of the graph's connected components, and put every vertex in one of the new groups:
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In the Excel Ribbon, select NodeXL, Analysis, Groups, Group by Connected Component.
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Show the graph to see the groups.
An isolate is a one-vertex connected component and is thus put into its own group.
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