Scalar coords vs. concat
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Description
Why does this work:
>> import xarray
>> a = xarray.DataArray([1, 2, 3], dims=['x'], coords={'y': 10})
>> b = xarray.DataArray([4, 5, 6], dims=['x'])
>> a + b
<xarray.DataArray (x: 3)>
array([5, 7, 9])
Coordinates:
y int64 10
But this doesn't?
>> xarray.concat([a, b], dim='x')
KeyError: 'y'
It doesn't seem coherent to me...
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
Reproduce the two examples from the issue, comparing scalar-coordinate handling in arithmetic with xarray.concat along the x dimension. Read the concat entry point and the surrounding coordinate-alignment behavior; done means the two operations have a documented and consistent outcome, covered by a regression test.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- python
- Domain
- data
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100