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  • ignamv · 4 ✖

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  • Bug in the conversion of Pandas DataFrame into Xarray Dataset . · 4 ✖

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  • NONE · 4 ✖
id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions performed_via_github_app issue
624652995 https://github.com/pydata/xarray/issues/4027#issuecomment-624652995 https://api.github.com/repos/pydata/xarray/issues/4027 MDEyOklzc3VlQ29tbWVudDYyNDY1Mjk5NQ== ignamv 408363 2020-05-06T13:34:49Z 2020-05-06T13:34:49Z NONE

It looks like this is fixed by 1eedc5c

 
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   Bug in the conversion of Pandas DataFrame into Xarray Dataset . 611879581
624623472 https://github.com/pydata/xarray/issues/4027#issuecomment-624623472 https://api.github.com/repos/pydata/xarray/issues/4027 MDEyOklzc3VlQ29tbWVudDYyNDYyMzQ3Mg== ignamv 408363 2020-05-06T12:36:55Z 2020-05-06T12:36:55Z NONE

Indeed, if I change this line from obj[dim] = (dim, lev) to obj[dim] = (dim, sorted(lev)) then this particular case works: Original Series row column -1 -3 0 -4 1 -2 -3 2 -4 3 dtype: int32 After going to DataArray and back row column -2 -4 3 -3 2 -1 -4 1 -3 0 dtype: int32

 
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   Bug in the conversion of Pandas DataFrame into Xarray Dataset . 611879581
624621313 https://github.com/pydata/xarray/issues/4027#issuecomment-624621313 https://api.github.com/repos/pydata/xarray/issues/4027 MDEyOklzc3VlQ29tbWVudDYyNDYyMTMxMw== ignamv 408363 2020-05-06T12:32:13Z 2020-05-06T12:32:13Z NONE

It looks like the following line causes the input data to be reordered, so it no longer matches the original dimensions:

https://github.com/pydata/xarray/blob/master/xarray/core/dataset.py#L4564

This would probably work if the dimensions were sorted before putting them into the dataset.

 
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   Bug in the conversion of Pandas DataFrame into Xarray Dataset . 611879581
624613640 https://github.com/pydata/xarray/issues/4027#issuecomment-624613640 https://api.github.com/repos/pydata/xarray/issues/4027 MDEyOklzc3VlQ29tbWVudDYyNDYxMzY0MA== ignamv 408363 2020-05-06T12:14:47Z 2020-05-06T12:14:47Z NONE

Simpler example, if it's any use:

df = pd.DataFrame(np.arange(4).reshape((2,2)), index=[-1,-2], columns=[-3,-4]) df.index.name, df.columns.name = 'row', 'column' print('Original Series') print(df.stack()) print('After going to DataArray and back') print(df.stack().to_xarray().to_series()) Output Original Series row column -1 -3 0 -4 1 -2 -3 2 -4 3 dtype: int32 After going to DataArray and back row column -1 -3 3 -4 2 -2 -3 1 -4 0 dtype: int32

 
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   Bug in the conversion of Pandas DataFrame into Xarray Dataset . 611879581

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