# C/igraph 0.9.7

**URL:** <https://igraph.discourse.group/t/c-igraph-0-9-7/1147>\
**Category:** Announcements\
**Created:** [16 March 2022 13:05 UTC](https://igraph.discourse.group/t/c-igraph-0-9-7/1147 "2022-03-16T13:05:39Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![tamas](https://yyz2.discourse-cdn.com/free1/user_avatar/igraph.discourse.group/tamas/32/1261_2.png) [@tamas](https://igraph.discourse.group/u/tamas)\
**Post date:** [16 March 2022 13:05 UTC](https://igraph.discourse.group/t/c-igraph-0-9-7/1147/1 "2022-03-16T13:05:39Z")

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[C/igraph](https://igraph.org/c/) 0.9.7 is now released.

The source can be obtained from [the GitHub releases page](https://github.com/igraph/igraph/releases/tag/0.9.7).

This release includes bug fixes, build system tweaks and minor (performance and non-performance-related) improvements.

### Changed

- `igraph_get_all_shortest_paths_dijsktra()` now uses tolerances when comparing path lengths, and is thus robust to numerical roundoff errors.
- `igraph_vector_*_swap` and `igraph_matrix_swap` now take O(1) instead of O(n) and accept all sizes.

### Fixed

- NCOL and LGL format writers no longer accept “name” and “weight” attributes of invalid types.
- The LGL writer could not access numerical weight attributes, potentially leading to crashes.
- External PLFIT libraries and their headers are now detected at their standard installation location.
- `igraph_vector_init()` no longer accepts negative vector sizes.
- `igraph_assortativity_nominal()` crashed on the null graph.
- Label propagation now ensures that all labels are dominant.
- Fixed incorrect partition results for walktrap algorithm (issue #1927)
- Negative values returned by `igraph_rng_get_integer()` and `RNG_INTEGER()` were incorrect, one larger than they should have been.
- `igraph_community_walktrap()` now checks its `steps` input argument.
- The first modularity value reported by `igraph_community_walktrap()` was incorrect (it was always zero). This is now fixed.
- `igraph_correlated_game()` would return incorrect results, or exhaust the memory, for most input graphs that were not generated with `igraph_erdos_renyi_game_gnp()`.

### Other

- The C attribute handler now verifies attribute types when retrieving attributes.
- Documentation improvements