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https://github.com/pydata/xarray/pull/3936#issuecomment-650300879 https://api.github.com/repos/pydata/xarray/issues/3936 650300879 MDEyOklzc3VlQ29tbWVudDY1MDMwMDg3OQ== 3958036 2020-06-26T17:24:55Z 2020-06-26T17:24:55Z CONTRIBUTOR

calling on a array with missing values raises ValueError: All-NaN slice encountered (try ds = xr.tutorial.open_dataset("rasm"); ds.argmin(dim="y"))

Some missing values should be OK. In your example though for example In [27]: ds.Tair.isel(time=0, x=0).values Out[27]: array([nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan]) So there are no values in the array slice that argmin should be applied over, which is an error.

I guess we could add some special handling for this (not sure what though, because we can't set a variable with type int to nan or None), but I think that is a separate issue that would need a new PR.

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