issue_comments: 391909283

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https://github.com/pydata/xarray/issues/2183#issuecomment-391909283 https://api.github.com/repos/pydata/xarray/issues/2183 391909283 MDEyOklzc3VlQ29tbWVudDM5MTkwOTI4Mw== 6815844 2018-05-25T00:54:31Z 2018-05-25T00:54:31Z MEMBER

Thanks for the report. I agree this is somehow unintuitive, but it is an intended behavior. The reason is that np.nan is float.

Similar with your example python In [7]: test_ds.where(test_ds['var2'] == 2)['var1'] Out[7]: <xarray.DataArray 'var1' (dim_0: 5)> array([nan, nan, nan, nan, nan]) Dimensions without coordinates: dim_0 where nan is used to indicate where the condition is not satified.

 
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