R count number of subgraphs/components in a graph
Does anyone know any R packages or methods to count the number of subgraph in a graph? I know igraph can handle some measurements of the graph, but I don't find related functions to count the number of subgraphs in a graph. For example, the number of subgraphs in the below graph should be 4.
Many thanks!
Most directly, you can use igraph::count_components:
count_components(ig)
# [1] 4
(Using Maurits's nicely shared sample data)
Component is a better term than subgraph for what you're looking for - a subgraph can be any subset of a graph, connected or not. Per wikipedia:
a component of an undirected graph is a connected subgraph that is not part of any larger connected subgraph. The components of any graph partition its vertices into disjoint sets, and are the induced subgraphs of those sets.
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