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  • Set one-dimensional data variable as dimension coordinate? · 7 ✖

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557325065 https://github.com/pydata/xarray/issues/2461#issuecomment-557325065 https://api.github.com/repos/pydata/xarray/issues/2461 MDEyOklzc3VlQ29tbWVudDU1NzMyNTA2NQ== keewis 14808389 2019-11-21T23:53:25Z 2019-11-21T23:53:25Z MEMBER

just note that in the end the result is still 2D with the missing values filled with nan

 
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   Set one-dimensional data variable as dimension coordinate? 366626025
557322577 https://github.com/pydata/xarray/issues/2461#issuecomment-557322577 https://api.github.com/repos/pydata/xarray/issues/2461 MDEyOklzc3VlQ29tbWVudDU1NzMyMjU3Nw== keewis 14808389 2019-11-21T23:42:28Z 2019-11-21T23:42:28Z MEMBER

to get your example to work, use this: python data=pd.DataFrame({'x': [0, 1, 2], 'y': ['a', 'b', 'c'],'z': ['a', 'b', 'c']}) xr.DataArray(data.x, coords={'y': data.y, 'x':data.z}, dims="y") to get both as dimensions, use python df = pd.DataFrame({'x': [0, 1, 2], 'y': ['a', 'b', 'c'],'z': ['a', 'b', 'c']}) ds = df.set_index(["y", "z"]).to_xarray()

 
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   Set one-dimensional data variable as dimension coordinate? 366626025
557320245 https://github.com/pydata/xarray/issues/2461#issuecomment-557320245 https://api.github.com/repos/pydata/xarray/issues/2461 MDEyOklzc3VlQ29tbWVudDU1NzMyMDI0NQ== dcherian 2448579 2019-11-21T23:33:21Z 2019-11-21T23:33:21Z MEMBER

So that's not possible. You can't have both y and z be 1D coordinate variables for x since x is 1D.

What are you ultimately trying to do after the conversion to DataArray?

 
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   Set one-dimensional data variable as dimension coordinate? 366626025
557315718 https://github.com/pydata/xarray/issues/2461#issuecomment-557315718 https://api.github.com/repos/pydata/xarray/issues/2461 MDEyOklzc3VlQ29tbWVudDU1NzMxNTcxOA== dcherian 2448579 2019-11-21T23:17:31Z 2019-11-21T23:17:31Z MEMBER

ds.rename_dims({"i": "y"})

Is this what you want?

 
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   Set one-dimensional data variable as dimension coordinate? 366626025
426906908 https://github.com/pydata/xarray/issues/2461#issuecomment-426906908 https://api.github.com/repos/pydata/xarray/issues/2461 MDEyOklzc3VlQ29tbWVudDQyNjkwNjkwOA== fujiisoup 6815844 2018-10-04T06:59:56Z 2018-10-04T06:59:56Z MEMBER

It might be worth putting a "see also" note in the assign_coords and set_coords documentation for this. I tried searching quite a bit, but did not find this.

Thanks for the suggestion. It sounds a good idea. Do you mind to send a PR for this?

 
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   Set one-dimensional data variable as dimension coordinate? 366626025
426898980 https://github.com/pydata/xarray/issues/2461#issuecomment-426898980 https://api.github.com/repos/pydata/xarray/issues/2461 MDEyOklzc3VlQ29tbWVudDQyNjg5ODk4MA== fujiisoup 6815844 2018-10-04T06:22:03Z 2018-10-04T06:22:03Z MEMBER

I'm closing this issue, but if you have further issue, do not hesitate to reopen this. 

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   Set one-dimensional data variable as dimension coordinate? 366626025
426898835 https://github.com/pydata/xarray/issues/2461#issuecomment-426898835 https://api.github.com/repos/pydata/xarray/issues/2461 MDEyOklzc3VlQ29tbWVudDQyNjg5ODgzNQ== fujiisoup 6815844 2018-10-04T06:21:23Z 2018-10-04T06:21:23Z MEMBER

Hi @nedclimaterisk. Thanks for the raising an issue.

In that case, you can use swap_dims,

```python In [1]: import xarray as xr ...: ds = xr.Dataset({'x': ('i', [0, 1, 2]), 'y': ('i', ['a', 'b', 'c'])}) ...: ds ...: ...: Out[1]: <xarray.Dataset> Dimensions: (i: 3) Dimensions without coordinates: i Data variables: x (i) int64 0 1 2 y (i) <U1 'a' 'b' 'c'

In [2]: ds.swap_dims({'i': 'x'}) Out[2]: <xarray.Dataset> Dimensions: (x: 3) Coordinates: * x (x) int64 0 1 2 Data variables: y (x) <U1 'a' 'b' 'c' ```

 
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   Set one-dimensional data variable as dimension coordinate? 366626025

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