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  • groupby(multi-index level) not working correctly on a multi-indexed DataArray or DataSet · 1 ✖

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  • CONTRIBUTOR · 1 ✖
id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions performed_via_github_app issue
1254926860 https://github.com/pydata/xarray/issues/6836#issuecomment-1254926860 https://api.github.com/repos/pydata/xarray/issues/6836 IC_kwDOAMm_X85KzKoM FabianHofmann 19226431 2022-09-22T12:03:52Z 2022-09-22T12:03:52Z CONTRIBUTOR

After trying to dig down further into the code, I saw that grouping over levels seems to be broken generally (up-to-date main branch at time of writing), i.e.

```python import pandas as pd import numpy as np import xarray as xr

midx = pd.MultiIndex.from_product([list("abc"), [0, 1]], names=("one", "two")) mda = xr.DataArray(np.random.rand(6, 3), [("x", midx), ("y", range(3))]) mda.groupby("one").sum() ```

raises: ```python

File ".../xarray/xarray/core/_reductions.py", line 5055, in sum return self.reduce(

File ".../xarray/xarray/core/groupby.py", line 1191, in reduce return self.map(reduce_array, shortcut=shortcut)

File ".../xarray/xarray/core/groupby.py", line 1095, in map return self._combine(applied, shortcut=shortcut)

File ".../xarray/xarray/core/groupby.py", line 1127, in _combine index, index_vars = create_default_index_implicit(coord)

File ".../xarray/xarray/core/indexes.py", line 974, in create_default_index_implicit index = PandasMultiIndex(array, name)

File ".../xarray/xarray/core/indexes.py", line 552, in init raise ValueError(

ValueError: conflicting multi-index level name 'one' with dimension 'one' ` in the functioncreate_default_index_implicit``. I am still a bit puzzled how to approach this. Any idea @benbovy?

 
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   groupby(multi-index level) not working correctly on a multi-indexed DataArray or DataSet 1318992926

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