sna (version 2.8)

sna.operators: Graphical Operators

Description

These operators allow for algebraic manupulation of graph adjacency matrices.

Usage

# S3 method for matrix
%c%(e1,e2)

Value

The resulting adjacency matrix.

Arguments

e1

an (unvalued) adjacency matrix.

e2

another (unvalued) adjacency matrix.

Author

Carter T. Butts

Details

Currently, only one operator is supported. x %c% y returns the adjacency matrix of the composition of graphs with adjacency matrices x and y (respectively). (Note that this may contain loops.)

References

Wasserman, S. and Faust, K. (1994). Social Network Analysis: Methods and Applications. Cambridge: University of Cambridge Press.

Examples

#Create an in-star
g<-matrix(0,6,6)
g[2:6,1]<-1
gplot(g)

#Compose g with its transpose
gcgt<-g%c%t(g)
gplot(gcgt,diag=TRUE)
gcgt