Read and write a graph-object

Construct a graph-object from a file or a matrix; write graph-object to file

inla.read.graph(..., size.only = FALSE)
inla.write.graph(graph, filename = "graph.dat", mode = c("binary", "ascii"), ...)

# S3 method for class 'inla.graph'
summary(object, ...)
# S3 method for class 'inla.graph'
plot(x, y, ...)
# S3 method for class 'inla.graph.summary'
print(x, ...)

Arguments

filename: The filename of the graph.
graph: An inla.graph-object, a (sparse) symmetric matrix, a filename containing the graph, a list or collection of characters and/or numbers defining the graph, or a neighbours list with class nb (see spdep::card and spdep::poly2nb for for details of nb and an example a function returning an nb object
mode: The mode of the file; ascii-file or a (gzip-compressed) binary. Default value depends on the inla.option internal.binary.mode which is default TRUE; see inla.setOption.
object: An inla.graph -object
x: An inla.graph -object
y: Not used
size.only: Only read the size of the graph
...: Additional arguments. In inla.read.graph, then it is the graph definition (object, matrix, character, filename), plus extra arguments. In inla.write.graph it is extra arguments to inla.read.graph.

Value

The output of inla.read.graph, is an inla.graph object, with elements

n

is the size of the graph

nnbs

is a vector with the number of neigbours

nbs

is a list-list with the neigbours

cc

list with connected component information

idis a vector with the connected component id for each node (starting from 1)
nis the number of connected components
nodesis a list-list of nodes belonging to each connected component

Methods implemented for inla.graph are summary and plot. The method plot require the libraries Rgraphviz and graph from the Bioconductor-project, see https://www.bioconductor.org.

Author

Havard Rue hrue@r-inla.org

Arguments

Value

Author

See also

Examples