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  • single coordinate is overwritten with dimension by set_index · 3 ✖

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id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions performed_via_github_app issue
435602025 https://github.com/pydata/xarray/issues/2537#issuecomment-435602025 https://api.github.com/repos/pydata/xarray/issues/2537 MDEyOklzc3VlQ29tbWVudDQzNTYwMjAyNQ== max-sixty 5635139 2018-11-03T16:38:23Z 2018-11-03T16:38:23Z MEMBER

Thanks!

I agree. For a comparable case when a list of length 2 is passed:

```python

d = xr.DataArray([0], coords={'coord1': ('dim', [0]), 'coord2': ('dim', [1])}, dims=['dim'])

In [22]: d Out[22]: <xarray.DataArray (dim: 1)> array([0]) Coordinates: coord2 (dim) int64 1 coord1 (dim) int64 0 Dimensions without coordinates: dim

In [23]: d.set_index(append=True, dim=['coord1','coord2']) Out[23]: <xarray.DataArray (dim: 1)> array([0]) Coordinates: * dim (dim) MultiIndex - coord1 (dim) int64 0 - coord2 (dim) int64 1 ```

I think the rule should be that if a list is passed, it's a multi-index, as per the doc-string.

 
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   single coordinate is overwritten with dimension by set_index 376953925
435553730 https://github.com/pydata/xarray/issues/2537#issuecomment-435553730 https://api.github.com/repos/pydata/xarray/issues/2537 MDEyOklzc3VlQ29tbWVudDQzNTU1MzczMA== max-sixty 5635139 2018-11-03T02:30:06Z 2018-11-03T02:31:51Z MEMBER

Thanks @mschrimpf

Could you clarify the intended output? 

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   single coordinate is overwritten with dimension by set_index 376953925
435526670 https://github.com/pydata/xarray/issues/2537#issuecomment-435526670 https://api.github.com/repos/pydata/xarray/issues/2537 MDEyOklzc3VlQ29tbWVudDQzNTUyNjY3MA== max-sixty 5635139 2018-11-02T22:24:02Z 2018-11-02T22:24:02Z MEMBER

Thanks for the issue @mschrimpf

The coord is there:

```python In [2]: d Out[2]: <xarray.DataArray (dim: 1)> array([0]) Coordinates: coord (dim) int64 0 Dimensions without coordinates: dim

```

...but .sel doesn't accept coordinate names, only on dimensions.

Is your issue that sel should accept coordinate names? 

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   single coordinate is overwritten with dimension by set_index 376953925

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