write.graph {igraph}R Documentation

Writing the graph to a file in some format

Description

write.graph is a general function for exporting graphs to foreign file formats, however not many formats are implemented right now.

Usage

write.graph(graph, file, format="edgelist", ...)

Arguments

graph The graph to export.
file A connection or a string giving the file name to write the graph to.
format Character string giving the file format. Right now pajek, graphml, edgelist, lgl and ncol are implemented.
... Other, format specific arguments, see below.

Details

The edgelist format is a simple text file, with one edge in a line, the two vertex ids separated by a space character. The file is sorted by the first and the second column.

The Pajek format is a text file, see read.graph for details. Appropriate vertex and edge attributes are also written to the file. This format has no additional arguments.

The GraphML format is a flexible XML based format. See read.graph for GraphML details. Vertex and edge attributes are also written to the file. This format has no additional arguments.

The lgl format is also a simple text file, this is the format expected by the 'Large Graph Layout' layout generator software. See read.graph for details. Additional arguments:

The ncol format is also used by LGL, it is a text file, see read.graph for details. Additional arguments:

Value

A NULL, invisibly.

Author(s)

Gabor Csardi csardi@rmki.kfki.hu

References

Adai AT, Date SV, Wieland S, Marcotte EM. LGL: creating a map of protein function with an algorithm for visualizing very large biological networks. J Mol Biol. 2004 Jun 25;340(1):179-90.

See Also

read.graph

Examples

g <- graph.ring(10)
## Not run: write.graph(g, "/tmp/g.txt", "edgelist")

[Package igraph version 0.2.1 Index]