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  • sharing dimensions across dataarrays in a dataset · 3 ✖

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431051341 https://github.com/pydata/xarray/issues/1471#issuecomment-431051341 https://api.github.com/repos/pydata/xarray/issues/1471 MDEyOklzc3VlQ29tbWVudDQzMTA1MTM0MQ== shoyer 1217238 2018-10-18T15:21:24Z 2018-10-18T15:21:24Z MEMBER

I'm marking #1408 as a bug so we won't forget about it. Hopefully it should be fixed automatically as part of the "explicit indexes" refactor.

On Thu, Oct 18, 2018 at 2:48 AM Ondrej Grover notifications@github.com wrote:

I indeed often resort to using a pandas.MultiIndex, but especially the dropping of the selected coordinate value (#1408 https://github.com/pydata/xarray/issues/1408) makes it quite inconvenient.

— You are receiving this because you commented. Reply to this email directly, view it on GitHub https://github.com/pydata/xarray/issues/1471#issuecomment-430946620, or mute the thread https://github.com/notifications/unsubscribe-auth/ABKS1pnDztKWoTaWEjzPpP6orveOMNWRks5umE6BgaJpZM4ORDdd . 

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   sharing dimensions across dataarrays in a dataset 241290234
430358013 https://github.com/pydata/xarray/issues/1471#issuecomment-430358013 https://api.github.com/repos/pydata/xarray/issues/1471 MDEyOklzc3VlQ29tbWVudDQzMDM1ODAxMw== shoyer 1217238 2018-10-16T19:00:16Z 2018-10-16T19:00:34Z MEMBER

You can use a pandas.MultiIndex with xarray. The interface/abstraction could be improved and has some rough edges (e.g., see especially https://github.com/pydata/xarray/issues/1603), but I think this is the preferred way to support these use cases. It does already work for indexing.

 
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   sharing dimensions across dataarrays in a dataset 241290234
313719395 https://github.com/pydata/xarray/issues/1471#issuecomment-313719395 https://api.github.com/repos/pydata/xarray/issues/1471 MDEyOklzc3VlQ29tbWVudDMxMzcxOTM5NQ== shoyer 1217238 2017-07-07T15:48:05Z 2017-07-07T15:48:05Z MEMBER

I'm afraid this isn't possible, by design. Every variable in a Dataset sharing the same coordinate system is enforced as part of the xarray data model. This makes data analysis and comparison with a Dataset quite straightforward, since everything is already on the same grid.

For cases where you need different coordinate values and/or dimension sizes, your options are to either rename dimensions for different variables or use multiple Dataset/DataArray objects (Python has nice built-in data structures).

In theory, we could add something like an "UnalignedDataset" that supports most of the Dataset methods without requiring alignment but I'm not sure it's worth the trouble.

 
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   sharing dimensions across dataarrays in a dataset 241290234

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