Extract one of the three levels of a multilevel network. extract_highlevel will extract the higher level vertices and the edges between them, extract_lowlevel will extract the lower level vertices and the edges between them. On the other hand, extract_mesolevel will extract all the vertices but only the edges between vertices from different levels.
extract_mesolevel(x)
Arguments
x: a graph object. Must be a multilevel network.
Returns
extract_highlevel and extract_lowlevel
return a 1-mode network. All the vertices in the selected level and the edges between them. extract_mesolevel returns a bipartite (2-mode) network. All the vertices are kept. Only edges between vertices of different levels are kept. This is what the literature also calls an affiliation network.