Return the Number of (Possibly Directed) Dyads in a Network Object

network.dyadcount returns the number of possible dyads within a network, removing those flagged as missing if desired. If the network is directed, directed dyads are counted accordingly.

Usage

# S3 method for class 'network'
network.dyadcount(x, na.omit = TRUE, ...)

Arguments

x: an object of class network
na.omit: logical; omit edges with na==TRUE from the count?
...: possible additional arguments, used by other implementations

Value

The number of dyads in the network

Details

The return value network.dyadcount is equal to the number of dyads, minus the number of NULL edges (and missing edges, if na.omit==TRUE). If x is directed, the number of directed dyads is returned. If the network allows loops, the number of possible entries on the diagnonal is added. Allthough the function does not give an error on multiplex networks or hypergraphs, the results probably don't make sense.

References

Butts, C. T. (2008). “network: a Package for Managing Relational Data in R.” Journal of Statistical Software, 24(2). doi:10.18637/jss.v024.i02

Author

Mark S. Handcock handcock@stat.washington.edu, skyebend

Examples


#Create a directed network with three edges
m<-matrix(0,3,3)
m[1,2]<-1; m[2,3]<-1; m[3,1]<-1
g<-network(m)
network.dyadcount(g)==6                 #Verify the directed dyad count
#> [1] TRUE
g<-network(m|t(m),directed=FALSE)
network.dyadcount(g)==3                         #nC2 in undirected case
#> [1] TRUE