# Pangeo Showcase: "Xarray's GroupBy, oh my!"

**URL:** <https://discourse.pangeo.io/t/pangeo-showcase-xarrays-groupby-oh-my/4666>\
**Category:** Pangeo Showcase\
**Created:** [November 7, 2024, 6:21pm UTC](https://discourse.pangeo.io/t/pangeo-showcase-xarrays-groupby-oh-my/4666 "2024-11-07T18:21:59Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![maxrjones](https://yyz2.discourse-cdn.com/flex030/user_avatar/discourse.pangeo.io/maxrjones/32/3190_2.png) [@maxrjones](https://discourse.pangeo.io/u/maxrjones)\
**Post date:** [November 7, 2024, 6:21pm UTC](https://discourse.pangeo.io/t/pangeo-showcase-xarrays-groupby-oh-my/4666/1 "2024-11-07T18:21:59Z")

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[![](https://canada1.discourse-cdn.com/flex030/uploads/pangeo/original/2X/3/3e4f3d77d0b32ca930f98bcede68ff289cc4bcac.jpeg "Xarray’s GroupBy, oh my!") ](https://www.youtube.com/watch?v=92-QU37W9WI)

**Title** : “Xarray’s GroupBy, oh my!”  
**Speaker** : Deepak Cherian (ORCID: [0000-0002-6861-8734](https://orcid.org/0000-0002-6861-8734))  
**When:** Wednesday, November 13, 2024 at 12 PM EST  
**Where:** [Launch Meeting - Zoom](https://numfocus-org.zoom.us/j/83234473026?pwd=mgM3uAuru1AE1aFPlRjW2dAAAyo8IY.1)  
**Abstract:**  
I will briefly demonstrate recent upgrades to Xarray’s GroupBy, including

1. [Grouping by multiple arrays](https://docs.xarray.dev/en/stable/user-guide/groupby.html#grouping-by-multiple-variables)
2. [New Grouper objects for custom grouping logic](https://docs.xarray.dev/en/stable/user-guide/groupby.html#grouper-objects), for example specifying order of groups (like seasons)
3. Sort by group using a [shuffle](https://github.com/pydata/xarray/pull/9320)
4. [Fast automatic choosing](https://flox.readthedocs.io/en/latest/implementation.html#heuristics) of parallel algorithm for reductions in flox
5. Faster reductions with [numbagg](https://github.com/numbagg/numbagg)

Agenda:

- ~15 minutes - Showcase presentation
- 10 - 30 minutes - Discussion
- 15 - 30 minutes - Community check-in

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**Author:** ![dcherian](https://yyz2.discourse-cdn.com/flex030/user_avatar/discourse.pangeo.io/dcherian/32/2235_2.png) [@dcherian](https://discourse.pangeo.io/u/dcherian)\
**Post date:** [November 14, 2024, 4:08pm UTC](https://discourse.pangeo.io/t/pangeo-showcase-xarrays-groupby-oh-my/4666/2 "2024-11-14T16:08:35Z")

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Thanks for coming!

Slides and notebook here: [Pangeo Showcase on updates to Xarray's GroupBy · GitHub](https://gist.github.com/dcherian/42411d8645573245045f0a55febf5fbe)