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  • Error when using .apply_ufunc with .groupby_bins · 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
603907867 https://github.com/pydata/xarray/issues/1765#issuecomment-603907867 https://api.github.com/repos/pydata/xarray/issues/1765 MDEyOklzc3VlQ29tbWVudDYwMzkwNzg2Nw== dcherian 2448579 2020-03-25T15:31:01Z 2020-03-25T15:31:01Z MEMBER

Closing since upstream issues have been closed.

 
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   Error when using .apply_ufunc with .groupby_bins 279909699
351588123 https://github.com/pydata/xarray/issues/1765#issuecomment-351588123 https://api.github.com/repos/pydata/xarray/issues/1765 MDEyOklzc3VlQ29tbWVudDM1MTU4ODEyMw== shoyer 1217238 2017-12-14T02:19:32Z 2017-12-14T02:19:32Z MEMBER

I looked into this a little more. The fix is to make a copy of bins inside _func: ```python def _func(data, bin_data, bins): """Group unlabeled array 'data' according to values in 'bin_data' using bins defined in 'bins' and sum all values""" bins = np.array(bins) labels = bins[1:] da_data = xr.DataArray(data, name='data') da_bin_data = xr.DataArray(bin_data, name='bin_data')

binned = da_data.groupby_bins(da_bin_data, bins, labels=labels,
                          include_lowest=True).sum()
return binned

```

The problem is that broadcasting (inside xarray.apply_ufunc/np.vectorize) produces readonly arrays, but the pandas function doesn't handle it properly (https://github.com/pandas-dev/pandas/issues/18773). We could potentially add a work-around in pandas to fix this, but the ultimate source issue is https://github.com/cython/cython/issues/1605

 
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   Error when using .apply_ufunc with .groupby_bins 279909699
350078447 https://github.com/pydata/xarray/issues/1765#issuecomment-350078447 https://api.github.com/repos/pydata/xarray/issues/1765 MDEyOklzc3VlQ29tbWVudDM1MDA3ODQ0Nw== shoyer 1217238 2017-12-07T20:02:08Z 2017-12-07T20:02:08Z MEMBER

You probably need to give bins an explicit 'dummy' dimension for using in apply_ufunc.

We should update apply_ufunc to error when given an unlabeled array as input for an argument that has core-dimensions defined.

 
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   Error when using .apply_ufunc with .groupby_bins 279909699

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