Igraph's internal data representation changes sometimes between
versions. This means that it is not possible to use igraph objects
that were created (and possibly saved to a file) with an older
igraph version.
Usage
graph_version(graph)
Arguments
graph
The input graph. If it is missing, then
the version number of the current data format is returned.
Value
A character scalar.
Details
graph_version queries the current data format,
or the data format of a possibly older igraph graph.
upgrade_graph can convert an older data format
to the current one.
See Also
upgrade_graph to convert the data format of a graph.