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  • shoyer · 5 ✖
id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions performed_via_github_app issue
289559455 https://github.com/pydata/xarray/issues/1326#issuecomment-289559455 https://api.github.com/repos/pydata/xarray/issues/1326 MDEyOklzc3VlQ29tbWVudDI4OTU1OTQ1NQ== shoyer 1217238 2017-03-27T19:28:36Z 2017-03-27T19:28:36Z MEMBER

One thing to make sure is if dim is already a scalar coordinate, it should be promoted to a 1D coordinate consisting of a single value.

 
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   Expand dimensions in xarray 216799807
289520057 https://github.com/pydata/xarray/issues/1326#issuecomment-289520057 https://api.github.com/repos/pydata/xarray/issues/1326 MDEyOklzc3VlQ29tbWVudDI4OTUyMDA1Nw== shoyer 1217238 2017-03-27T17:12:45Z 2017-03-27T17:12:45Z MEMBER

Looks good to me. I would just make the default axis=None and indicate that that means "insert all new dimension in order at the start of the result arrays".

 
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   Expand dimensions in xarray 216799807
289513566 https://github.com/pydata/xarray/issues/1326#issuecomment-289513566 https://api.github.com/repos/pydata/xarray/issues/1326 MDEyOklzc3VlQ29tbWVudDI4OTUxMzU2Ng== shoyer 1217238 2017-03-27T16:50:02Z 2017-03-27T16:50:02Z MEMBER

Do you think it is confusing if this method automatically detects the positional argument, i.e. if string is passed then it should be the axis name and an integer should be axis position.

Yes, I think this would be too confusing. Function arguments should do one thing.

What would da.expand_dims(axis=0) even do? Insert a new dimension with an auto-generated name like dim_0? That seems not very useful to me.

I guess that the reason that numpy doesn't support multiple axes insertion is it brings additional ambugousity to the new axes positions;

I think we could clarify this is by saying that axis indicates axis positions on the result array, not the input array, rather than corresponding to repeated application of expand_dims. So da.expand_dims(dim=['x' ,'y'], axis=[2, 1]) indicates that axis 2 on the result should be x and axis 1 should be y.

 
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   Expand dimensions in xarray 216799807
289497437 https://github.com/pydata/xarray/issues/1326#issuecomment-289497437 https://api.github.com/repos/pydata/xarray/issues/1326 MDEyOklzc3VlQ29tbWVudDI4OTQ5NzQzNw== shoyer 1217238 2017-03-27T15:54:18Z 2017-03-27T15:54:18Z MEMBER

@fujiisoup I like your proposed API, but I would switch the order of the method arguments. That way, users who don't care about axis position can use a positional argument.

We might also consider supporting inserting multiple axes at once, e.g., by passing a list/tuple to dim/axis. This would be easy to add later, though.

 
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   Expand dimensions in xarray 216799807
289084136 https://github.com/pydata/xarray/issues/1326#issuecomment-289084136 https://api.github.com/repos/pydata/xarray/issues/1326 MDEyOklzc3VlQ29tbWVudDI4OTA4NDEzNg== shoyer 1217238 2017-03-24T17:10:19Z 2017-03-24T17:10:19Z MEMBER

Can you propose what the API should look like?

 
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   Expand dimensions in xarray 216799807

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