as.matrix.network {network}R Documentation

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

## S3 method for class 'network':
as.matrix(x, matrix.type = NULL, attrname = NULL, ...)
## S3 method for class 'adjacency':
as.matrix.network(x,attrname=NULL, ...)
## S3 method for class 'edgelist':
as.matrix.network(x,attrname=NULL, ...)
## S3 method for class 'incidence':
as.matrix.network(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
... additional arguments.

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.

Value

An adjacency, incidence, or edgelist matrix

Author(s)

Carter T. Butts buttsc@uci.edu and David Hunter dhunter@stat.psu.edu

References

Butts, C. T. (2008). “network: a Package for Managing Relational Data in R.” Journal of Statistical Software, 24(2). http://www.jstatsoft.org/v24/i02/

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

[Package network version 1.4-1 Index]