About igraph releases and other things

C/igraph 0.10.10

C/igraph 0.10.10, the ninth bugfix release of the 0.10 series, has arrived.

The source can be obtained from the GitHub releases page.

This is primarily a maintenance release with bug fixes, in particular a caching issue in igraph_is_forest().

Read on for more details about the changes in version 0.10.10.


  • 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.