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  • shoyer · 2 ✖
id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions performed_via_github_app issue
295791392 https://github.com/pydata/xarray/issues/1378#issuecomment-295791392 https://api.github.com/repos/pydata/xarray/issues/1378 MDEyOklzc3VlQ29tbWVudDI5NTc5MTM5Mg== shoyer 1217238 2017-04-20T15:59:40Z 2017-04-20T15:59:40Z MEMBER

I cannot see a use case in which repeated dims actually make sense.

Agreed. I would have disallowed them entirely, but sometimes it's useful to allow loading variables with duplicate dimensions, even if the only valid operation you can do is de-duplicate them.

Every routine that looks up dimensions by name should go through the get_axis_num method. That would be a good place to add a check for uniqueness.

 
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   Many methods are broken (e.g., concat/stack/sortby) when using repeated dimensions 222676855
295431292 https://github.com/pydata/xarray/issues/1378#issuecomment-295431292 https://api.github.com/repos/pydata/xarray/issues/1378 MDEyOklzc3VlQ29tbWVudDI5NTQzMTI5Mg== shoyer 1217238 2017-04-19T20:39:33Z 2017-04-19T20:40:08Z MEMBER

Indeed, we don't have very good test coverage for operations with repeated dimensions. Fixes would certainly be appreciated, though they might be somewhat tricky. Even failing loudly with ValueError: repeated dimensions not yet supported would be an improvement over the current state.

 
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   Many methods are broken (e.g., concat/stack/sortby) when using repeated dimensions 222676855

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