write.graph {igraph} | R Documentation |
write.graph
is a general function for exporting
graphs to foreign file formats, however not many formats are
implemented right now.
write.graph(graph, file, format="edgelist", ...)
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. |
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:
NULL
if you want to use numeric
vertex ids even if there is a ‘name’ vertex attribute.NULL
here if you want to omit the weights.TRUE
the isolate vertices are
also written to the file, they are omitted by default.
The ncol
format is also used by LGL, it is a text file, see
read.graph for details.
Additional arguments:
NULL
if you want to use numeric
vertex ids even if there is a ‘name’ vertex attribute.NULL
here if you want to omit the weights.A NULL, invisibly.
Gabor Csardi csardi@rmki.kfki.hu
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.
g <- graph.ring(10) ## Not run: write.graph(g, "/tmp/g.txt", "edgelist")