Get the "graph" Part or Aspect of R Object
getGraph(x)
x |
potentially any R object which can be interpreted as a graph (with nodes and edges). |
a graph object, i.e., one inheriting from (the
virtual) class "graph", package graph.
signature(x = "ANY")the default method just tries
as(x, "graph"), so works when a coerce (S4)
method is defined for x.
signature(x = "pcAlgo")and
signature(x = "fciAlgo")extract the graph part explicitly.
signature(x = "matrix")interpret x as adjacency
matrix and return the corresponding "graphAM"
object.
For sparseMatrix methods, see the ‘Note’.
For large graphs, it may be attractive to work with sparse matrices from the Matrix package. If desired, you can activate this by
require(Matrix)
setMethod("getGraph", "sparseMatrix", function(x) as(x, "graphNEL"))
setMethod("getGraph", "Matrix", function(x) as(x, "graphAM"))Martin Maechler
A <- rbind(c(0,1,0,0,1),
c(0,0,0,1,1),
c(1,0,0,1,0),
c(1,0,0,0,1),
c(0,0,0,1,0))
sum(A) # 9
getGraph(A) ## a graph with 5 nodes and 'sum(A)' edgesPlease choose more modern alternatives, such as Google Chrome or Mozilla Firefox.