These functions convert relational data in matrix form to network edge sets.
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a matrix containing edge information
an object of class
logical; ignore edge value information in x?
a name for the edge attribute under which to store edge values, if any
possible additional arguments (such as
Each of the above functions takes a
network and a matrix
as input, and modifies the supplied
network object by adding the
x to be an
x to be an edgelist
x to be an incidence
x to be a two-mode
adjacency matrix where rows and columns reflect each respective mode
(conventionally, actors and events); If
(non-zero) edge values are stored as edgewise attributes with name
edge.check argument can be added via
... and will be passed to
Edgelist matrices to be used with
network.edgelist should have one
row per edge, with the first two columns indicating the sender and
receiver of each edge (respectively). Edge values may be provided in
additional columns. The edge attributes will be created with names
corresponding to the column names unless alternate names are provided via
names.eval. The vertices specified in the first two columns, which
can be characters, are added to the network in default sort order. The
edges are added in the order specified by the edgelist matrix.
Incidence matrices should contain one row per vertex, with one column per edge. A non-zero entry in the matrix means that the edge with the id corresponding to the column index will have an incident vertex with an id corresponding to the row index. In the directed case, negative cell values are taken to indicate tail vertices, while positive values indicate head vertices.
Results similar to
network.adjacency can also be obtained by means
of extraction/replacement operators. See the associated man page for
Invisibly, an object of class
network; these functions modify
their argument in place.
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/
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#Create an arbitrary adjacency matrix m<-matrix(rbinom(25,1,0.5),5,5) diag(m)<-0 g<-network.initialize(5) #Initialize the network network.adjacency(m,g) #Import the edge data #Do the same thing, using replacement operators g<-network.initialize(5) g[,]<-m # load edges from a data.frame via network.edgelist edata <-data.frame( tails=c(1,2,3), heads=c(2,3,1), love=c('yes','no','maybe'), hate=c(3,-5,2), stringsAsFactors=FALSE ) g<-network.edgelist(edata,network.initialize(4),ignore.eval=FALSE) as.sociomatrix(g,attrname='hate') g%e%'love' # load edges from an incidence matrix inci<-matrix(c(1,1,0,0, 0,1,1,0, 1,0,1,0),ncol=3,byrow=FALSE) inci g<-network.incidence(inci,network.initialize(4,directed=FALSE)) as.matrix(g)
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