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id node_id number title user state locked assignee milestone comments created_at updated_at ▲ closed_at author_association active_lock_reason draft pull_request body reactions performed_via_github_app state_reason repo type
366510937 MDU6SXNzdWUzNjY1MTA5Mzc= 2460 Update docs to include how to Join using a non-index coord max-sixty 5635139 open 0 max-sixty 5635139   3 2018-10-03T20:19:15Z 2018-11-01T15:37:44Z   MEMBER      

I originally posted this on SO, as I thought it was a user question rather than a library issue. But after working on it more today, I'm not so sure.

I'm trying to do a 'join' in xarray, but using a non-index coordinate rather than a shared dim.

I have a Dataset indexed on 'a' with a coord on 'b', and a DataArray indexed on 'b':

```python In [17]: ds=xr.Dataset(dict(a=(('x'),np.random.rand(10))), coords=dict(b=(('x'),list(range(10)))))

In [18]: ds Out[18]: <xarray.Dataset> Dimensions: (x: 10) Coordinates: b (x) int64 0 1 2 3 4 5 6 7 8 9 Dimensions without coordinates: x Data variables: a (x) float64 0.3634 0.2132 0.6945 0.5359 0.1053 0.07045 0.5945 ...

In [19]: da=xr.DataArray(np.random.rand(10), dims=('b',), coords=dict(b=(('b'),list(range(10)))))

In [20]: da Out[20]: <xarray.DataArray (b: 10)> array([0.796987, 0.275992, 0.747882, 0.240374, 0.435143, 0.285271, 0.753582, 0.556038, 0.365889, 0.434844]) Coordinates: * b (b) int64 0 1 2 3 4 5 6 7 8 9

```

Can I add da onto my dataset, by joining on ds.b equalling da.b? The result would be:

python <xarray.Dataset> Dimensions: (x: 10) Coordinates: b (x) int64 0 1 2 3 4 5 6 7 8 9 Dimensions without coordinates: x Data variables: a (x) float64 0.3634 0.2132 0.6945 0.5359 0.1053 0.07045 0.5945 ... da (x) float64 0.796987, 0.275992, 0.747882, 0.240374, 0.435143 ...

(for completeness - the data isn't current in the correct position)

 
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     xarray 13221727 issue

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