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+---
+title: "The igraph R package crossed the 2.0 threshold!"
+date: 2024-05-21
+tags: r
+---
+
+We're thrilled to announce that igraph 2.0 has been released!
+In this post, we highlight the most important changes.
+
+# The R package is now in sync with the C core
+
+This major release brings development in line with the igraph C library
+at [https://github.com/igraph/igraph](https://github.com/igraph/igraph).
+Version 1.6.0 of the R package used version 0.9.10 of the C core. 
+The changes in the 0.10 series of the C core are now taken up in version 2.0 of the R package. 
+Having the R package use the latest version of the C core was a huge undertaking, and is a great milestone which makes the many improvements from version 0.10 of the C core available to R users.
+
+Improvements made in the C core will be made available more easily in
+functions in the R package. 
+See the [complete changelog](https://github.com/igraph/rigraph/blob/main/src/vendor/cigraph/CHANGELOG.md) of the C core. 
+While we tried to maintain compatibility with version 1.6.0 of the R interface, it wasn't always possible. 
+Refer to the "Breaking changes" sections in the changelog of the R package
+([breaking changes section](https://r.igraph.org/news/index.html#breaking-changes-2-0-0)).
+If you maintain a package that depends on igraph, you may have heard from us.
+
+The move to version 0.10 of C/igraph brings many quality improvements,
+including support for graphs with billions of vertices and edges on 64-bit computers, much more stringent error checking, 
+as well as lots of improvements to robustness, reliability and mathematical consistency
+across functions.
+
+Future work will aim at further automating the generation of R code from C code, making improved C core functionality more quickly available to R users. 
+Additionally, we plan to expose more C core functions, since not all functions are available to R users just yet.
+
+# Improvements to the documentation
+
+The igraph R package now has a [website](https://r.igraph.org/), generated with the popular pkgdown R package, that is to say, a website that has a predictable structure and that includes a search functionality. 
+The website now features an introductory vignette contributed by [Adrian Diaz](https://github.com/adriandiazlab) and Fabio Zanini in both [English](https://r.igraph.org/articles/igraph.html) and [Spanish](https://r.igraph.org/articles/igraph_ES.html).
+
+# Towards a more explicit lifecycle
+
+We are in the middle of efforts aimed at making the lifecycle of functions more explicit so that you might know what function is deprecated, and which function is more experimental. 
+For instance, we will slowly be removing most ["dotted-names functions"](https://r.igraph.org/articles/deprecated-dot-case.html),
+like add.edges() that is now add_edges(), although both versions currently still work. 
+The [`is_biconnected()`
+function](https://r.igraph.org/reference/is_biconnected.html) is an example of an experimental function, that is to say, a C function that was just exposed.
+
+# Conclusion
+
+We'd be thankful to hear from you if you experience any difficulty with the new release. 
+Please cast us a line (and a [reprex](https://reprex.tidyverse.org/)!) in the [issue tracker](https://github.com/igraph/rigraph/issues). 
+For further feedback, please use igraph's [discussion forum](https://igraph.discourse.group). 
+Do not hesitate to share about the release... in your networks. 😉
+
+# Acknowledgements
+
+```{r, eval=FALSE, echo=FALSE}
+usethis::use_tidy_thanks(repo_spec = "igraph/rigraph", from = "v1.6.0", to = NULL)
+```
+
+Thanks a ton to all the contributors who helped us craft the new igraph package: [@a-lambda](https://github.com/a-lambda), [@Antonov548](https://github.com/Antonov548), [@barracuda156](https://github.com/barracuda156), [@bebejhun](https://github.com/bebejhun), [@bockthom](https://github.com/bockthom), [@brooksambrose](https://github.com/brooksambrose), [@CdeMills](https://github.com/CdeMills), [@clpippel](https://github.com/clpippel), [@csqsiew](https://github.com/csqsiew), [@dmurdoch](https://github.com/dmurdoch), [@Flu09](https://github.com/Flu09), [@Ganson2018](https://github.com/Ganson2018), [@gherrarte](https://github.com/gherrarte), [@gwfs521](https://github.com/gwfs521), [@jefferis](https://github.com/jefferis), [@jeroen](https://github.com/jeroen), [@jessijessi](https://github.com/jessijessi), [@joshua-zh](https://github.com/joshua-zh), [@kalibera](https://github.com/kalibera), [@knwng](https://github.com/knwng), [@krlmlr](https://github.com/krlmlr), [@Lighter-k](https://github.com/Lighter-k), [@louisaslett](https://github.com/louisaslett), [@lptolik](https://github.com/lptolik), [@lufuhao](https://github.com/lufuhao), [@maelle](https://github.com/maelle), [@maksymiuks](https://github.com/maksymiuks), [@Matyasch](https://github.com/Matyasch), [@mfansler](https://github.com/mfansler), [@ngmaclaren](https://github.com/ngmaclaren), [@noriakis](https://github.com/noriakis), [@reuning](https://github.com/reuning), [@snowGlint](https://github.com/snowGlint), [@stephenashton-dhsc](https://github.com/stephenashton-dhsc), [@szhorvat](https://github.com/szhorvat), [@tdhock](https://github.com/tdhock), [@vtraag](https://github.com/vtraag), [@xinguo1236](https://github.com/xinguo1236), and [@Zhaoju-Deng](https://github.com/Zhaoju-Deng).