network (version 1.0-1)

as.matrix.network: Coerce a Network Object to Matrix Form

Description

The as.matrix methods attempt to coerce their input to a matrix in adjacency, incidence, or edgelist form. Edge values (from a stored attribute) may be used if present.

Usage

as.matrix.network(x, matrix.type = NULL, attrname = NULL)
as.matrix.network.adjacency(x,attrname=NULL)
as.matrix.network.edgelist(x,attrname=NULL)
as.matrix.network.incidence(x,attrname=NULL)

Arguments

x

an object of class network

matrix.type

one of "adjacency", "incidence", "edgelist", or NULL

attrname

optionally, the name of an edge attribute to use for edge values

Value

• An adjacency, incidence, or edgelist matrix

Details

If no matrix type is specified, which.matrix.type will be used to make an educated guess based on the shape of x. Where edge values are not specified, a dichotomous matrix will be assumed. Note that adjacency matrices may also be obtained using the extraction operator. See the relevant man page for details.

References

Butts, C.T. 2002. ``Memory Structures for Relational Data in R: Classes and Interfaces'' Working Paper.

See Also

which.matrix.type, network, network.extraction

Examples

#Create a random network
m <- matrix(rbinom(25,1,0.5),5,5)
diag(m) <- 0
g <- network(m)

#Coerce to matrix form
as.matrix.network(g,matrix.type="adjacency")
as.matrix.network(g,matrix.type="incidence")
as.matrix.network(g,matrix.type="edgelist")

#Can also use the extraction operator
g[,]                            #Get entire adjacency matrix
g[1:5,6:10]                     #Obtain a submatrix