About igraph releases and other things

C/igraph 0.9.8

C/igraph 0.9.8, the eighth bugfix release of the 0.9 series, has arrived.

The source can be obtained from the GitHub releases page.

This release includes bug fixes and documentation improvements only. Read on for more details.


  • Assertion failure in igraph_bfs() when an empty roots or restricted vector was provided.
  • igraph_diversity() now returns 0 for degree-1 vertices. Previously it incorrectly returned NaN or +-Inf depending on roundoff errors.
  • igraph_community_walktrap() does not crash any more when provided with modularity=NULL and membership=NULL.


  • Documentation improvements.