# About the Usage category **URL:** \ **Category:** Usage\ **Created:** [27 January 2020 12:56 UTC](https://igraph.discourse.group/t/about-the-usage-category/30 "2020-01-27T12:56:17Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![vtraag](https://yyz2.discourse-cdn.com/free1/user_avatar/igraph.discourse.group/vtraag/32/38_2.png) [@vtraag](https://igraph.discourse.group/u/vtraag)\ **Post date:** [27 January 2020 12:56 UTC](https://igraph.discourse.group/t/about-the-usage-category/30/1 "2020-01-27T12:56:17Z")
Questions about using `igraph`. Since `igraph` is available in several different languages, you are asked to tag your post to indicate the language. When posting questions: - try to be as precise as possible; - if possible, provide a minimal working example; - report the OS you are on, and its version; - report the version of `igraph` you are working with. - when using igraph from a high-level language, report the version of the host language (R, Python or Mathematica) ---
**Author:** ![GroteGnoom](https://yyz2.discourse-cdn.com/free1/user_avatar/igraph.discourse.group/grotegnoom/32/428_2.png) [@GroteGnoom](https://igraph.discourse.group/u/GroteGnoom)\ **Post date:** [31 May 2022 07:35 UTC](https://igraph.discourse.group/t/about-the-usage-category/30/2 "2022-05-31T07:35:26Z")
2 posts were split to a new topic: [Invalid vertex id error using tidygraph](https://igraph.discourse.group/t/invalid-vertex-id-error-using-tidygraph/1233)