Convert objects to class "network"
Convert objects to class "network"
asNetwork(x, ...) ## S3 method for class 'data.frame' asNetwork(x, directed = TRUE, vertices = NULL, ...) ## S3 method for class 'igraph' asNetwork(x, amap = attrmap(), ...)
x |
an R object to be coerced, see Details for the description of available methods |
directed |
logical, whether the created network should be directed |
vertices |
NULL or data frame, optional data frame containing vertex attributes |
amap |
data.frame with attribute copy/rename rules, see
|
... |
other arguments from/to other methods |
This is a generic function which dispatches on argument x. It creates
objects of class "network" from other R objects.
The method for data frames is inspired by the similar function in package
igraph: graph.data.frame. It assumes that first
two columns of x constitute an edgelist. The remaining columns are
interpreted as edge attributes. Optional argument vertices allows for
including vertex attributes. The first column is assumed to vertex id, the
same that is used in the edge list. The remaining colums are interpreted as
vertex attributes.
The method for objects of class "igraph" takes the network of that class and
converts it to data frames using asDF. The network is recreated
in class "network" using asNetwork.data.frame. The function currently
does not support bipartite "igraph" networks.
Object of class "network".
asIgraph for conversion in the other direction.
# require package 'network' as 'asNetwork' generic is defined there
if(require(network, quietly=TRUE))
{
### demonstrating method for data frames
l <- asDF(exNetwork)
g <- asNetwork( l$edges, vertices=l$vertexes)
stopifnot(all.equal(g, exNetwork))
### method for igraph objects
ig <- asNetwork(exIgraph)
identical( as.numeric(as.matrix(g, "adjacency")),
as.numeric(as.matrix(ig, "adjacency")))
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