Pattern detection in bipartite networks: A review of terminology, applications, and methods
Fig 4
A classification scheme of bipartite randomization algorithms, based on whether the matrix row and columns sums are preserved exactly (Fixed, F), preserved on average (Proportional, P), or unconstrained (Equiprobable, E).
Black cells in each matrix indicate presence of links (i.e., 1s) between the items in rows and the items in columns, while white cells indicate the absence of links (i.e., 0s).