Writing the graph to a file in some format

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 = c("edgelist", "pajek", "ncol", "lgl", "graphml", "dimacs", "gml", "dot",
    "leda"),
  ...
)

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, dot, gml, edgelist, lgl, ncol and dimacs are implemented. As of igraph 0.4 this argument is case insensitive.
...: Other, format specific arguments, see below.

Value

A NULL, invisibly.

Edge list format

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. This format has no additional arguments.

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.

Author

Gabor Csardi csardi.gabor@gmail.com

Examples


g <- make_ring(10)
file <- tempfile(fileext = ".txt")
write_graph(g, file, "edgelist")
if (!interactive()) {
  unlink(file)
}