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  • shoyer · 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
1434932769 https://github.com/pydata/xarray/issues/4079#issuecomment-1434932769 https://api.github.com/repos/pydata/xarray/issues/4079 IC_kwDOAMm_X85Vh1Yh shoyer 1217238 2023-02-17T17:03:52Z 2023-02-17T17:03:52Z MEMBER

I agree, automatic dimension only ever really made sense for interactive usecases, where a user could see and fix the default names.

It's a little late to change the default now to raising an error instead, but maybe we could add a warning?

 
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   Unnamed dimensions 621078539
630936142 https://github.com/pydata/xarray/issues/4079#issuecomment-630936142 https://api.github.com/repos/pydata/xarray/issues/4079 MDEyOklzc3VlQ29tbWVudDYzMDkzNjE0Mg== shoyer 1217238 2020-05-19T16:33:49Z 2020-05-19T16:33:49Z MEMBER

In the specific example from your notebook, where do the dimensions lengths __variants/BaseCounts_dim1, __variants/MLEAC_dim1 and __variants/MLEAF_dim1 come from?

BaseCounts_dim1 is length 4, so maybe that corresponds to DNA bases ATGC?

 
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   Unnamed dimensions 621078539
630916682 https://github.com/pydata/xarray/issues/4079#issuecomment-630916682 https://api.github.com/repos/pydata/xarray/issues/4079 MDEyOklzc3VlQ29tbWVudDYzMDkxNjY4Mg== shoyer 1217238 2020-05-19T16:00:34Z 2020-05-19T16:00:34Z MEMBER

The main problem is that unnamed dimensions (in NumPy, at least) have different semantics than named dimensions, particular for how dimensions are matched up in broadcasting. For that reason, we really want all dimensions to always be named.

We could possibly add support for unnamed dimensions in the Dataset constructor, but on the other hand it also provides a gentle nudge to chose names.

 
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   Unnamed dimensions 621078539

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