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  • map_blocks doesn't handle tranposed arrays · 4 ✖

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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
842806452 https://github.com/pydata/xarray/issues/5326#issuecomment-842806452 https://api.github.com/repos/pydata/xarray/issues/5326 MDEyOklzc3VlQ29tbWVudDg0MjgwNjQ1Mg== dcherian 2448579 2021-05-18T03:58:50Z 2021-05-18T03:58:50Z MEMBER

I expected dimension order not to matter, as it is the case in most of xarray.

Yeah... the template is special, it must exactly match what the function returns. In your case, it seems like you know the dimension order. So you can transpose the template object to that dimension order

 
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   map_blocks doesn't handle tranposed arrays 893692903
842692873 https://github.com/pydata/xarray/issues/5326#issuecomment-842692873 https://api.github.com/repos/pydata/xarray/issues/5326 MDEyOklzc3VlQ29tbWVudDg0MjY5Mjg3Mw== andersy005 13301940 2021-05-17T22:51:54Z 2021-05-17T22:51:54Z MEMBER

I expected dimension order not to matter, as it is the case in most of xarray. Right now, my code wraps func in a another function that performs this transpose when needed.

Isn't it the case the order matters here because you are providing a template for map_blocks to follow? Would your code still work if you were to leave map_blocks to do the inference of the output dataset on its own as Deepak pointed out? From the code snippet you provided, it appears that map_blocks works without the template

python In [10]: dac.map_blocks(func).load() Out[10]: <xarray.DataArray <this-array> (y: 3, x: 2)> array([[0, 3], [1, 4], [2, 5]]) Dimensions without coordinates: y, x

 
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   map_blocks doesn't handle tranposed arrays 893692903
842671637 https://github.com/pydata/xarray/issues/5326#issuecomment-842671637 https://api.github.com/repos/pydata/xarray/issues/5326 MDEyOklzc3VlQ29tbWVudDg0MjY3MTYzNw== dcherian 2448579 2021-05-17T22:02:31Z 2021-05-17T22:02:31Z MEMBER

You should be providing template = dac.transpose(). Does it work then? You can also not provide template in which case it will infer the right thing.

 
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   map_blocks doesn't handle tranposed arrays 893692903
842655926 https://github.com/pydata/xarray/issues/5326#issuecomment-842655926 https://api.github.com/repos/pydata/xarray/issues/5326 MDEyOklzc3VlQ29tbWVudDg0MjY1NTkyNg== max-sixty 5635139 2021-05-17T21:33:10Z 2021-05-17T21:33:10Z MEMBER

Hi @aulemahal !

Does this work with return d? Could you add the stack trace?

 
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   map_blocks doesn't handle tranposed arrays 893692903

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