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  • Selection of MultiIndex makes following `unstack` wrong · 2 ✖

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448536594 https://github.com/pydata/xarray/issues/2619#issuecomment-448536594 https://api.github.com/repos/pydata/xarray/issues/2619 MDEyOklzc3VlQ29tbWVudDQ0ODUzNjU5NA== fujiisoup 6815844 2018-12-19T09:56:45Z 2018-12-19T09:56:45Z MEMBER

Thanks @shoyer

I also noticed that the .sel method is working wrong too after the selection, python In [9]: ds.isel(xy=ds['x'] < 4).sel(x=5) # should be KeyError Out[9]: <xarray.DataArray (y: 0)> array([], dtype=int64) Coordinates: * y (y) int64 Probably better to call pd.MultiIndex.remove_unused_levels() after each selection. I'll send a fix.

 
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   Selection of MultiIndex makes following `unstack` wrong 392362056
448474051 https://github.com/pydata/xarray/issues/2619#issuecomment-448474051 https://api.github.com/repos/pydata/xarray/issues/2619 MDEyOklzc3VlQ29tbWVudDQ0ODQ3NDA1MQ== shoyer 1217238 2018-12-19T05:27:53Z 2018-12-19T05:27:53Z MEMBER

I agree, this is an xarray bug.

It seems that we need to drop unused levels in the MultiIndex as part of unstack(), by invoking pd.MultiIndex.remove_unused_levels().

 
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   Selection of MultiIndex makes following `unstack` wrong 392362056

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