Add histogram method
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- Python
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Description
On today's dev call, we discussed the possible role that numpy_groupies could play in xarray (#4540). I noted that many of the use cases for advanced grouping overlap significantly with histogram-type operations. A major need that we have is to take [weighted] histograms over some, but not all, axes of DataArrays. Since groupby doesn't allow this (see #1013), we started the standalone xhistogram package.
Given the broad usefulness of this feature, I suggested that we might want to deprecate xhistogram and move the histogram function to xarray. We may want to also reimplement it using numpy_groupies, which I think is smarter than our implementation in xhistogram.
I've opened this issue to keep track of the idea.
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by reading the xhistogram documentation and reviewing related issues #4540 and #1013. Compare the existing xhistogram approach with numpy_groupies, then clarify the desired API, axis handling, weighting, and deprecation or migration plan before identifying implementation and test locations. Done would require an agreed scope and an implemented, tested histogram feature in xarray.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- numpy, python
- Domain
- data
- Issue type
- Feature
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 25/100