C/igraph 0.10.10

C/igraph 0.10.10 is now released. As usual, the source can be obtained from the GitHub releases page. This release includes a fix to a potentially impactful bug in testing whether a graph is a forest, and is therefore recommended to all users of the 0.10 series.


  • When igraph_is_forest() determined that a graph is not a directed forest, and the roots output parameter was set to NULL, it would incorrectly cache that the graph is also not an undirected forest.
  • igraph_spanner() now correctly ignores edge directions, and no longer crashes on directed graphs.


  • igraph_are_connected() is renamed to igraph_are_adjacent(); the old name is kept available until at least igraph 1.0.


  • Documentation improvements.