Use this if you are using igraph from R
| dyad_census {igraph} | R Documentation | 
Classify dyads in a directed graphs. The relationship between each pair of vertices is measured. It can be in three states: mutual, asymmetric or non-existent.
dyad_census(graph)
graph | 
 The input graph. A warning is given if it is not directed.  | 
A named numeric vector with three elements:
mut | 
 The number of pairs with mutual connections.  | 
asym | 
 The number of pairs with non-mutual connections.  | 
null | 
 The number of pairs with no connection between them.  | 
Gabor Csardi csardi.gabor@gmail.com
Holland, P.W. and Leinhardt, S. A Method for Detecting Structure in Sociometric Data. American Journal of Sociology, 76, 492–513. 1970.
Wasserman, S., and Faust, K. Social Network Analysis: Methods and Applications. Cambridge: Cambridge University Press. 1994.
triad_census for the same classification, but with
triples.
g <- sample_pa(100)
dyad_census(g)