issue_comments: 649968866

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https://github.com/pydata/xarray/issues/4136#issuecomment-649968866 https://api.github.com/repos/pydata/xarray/issues/4136 649968866 MDEyOklzc3VlQ29tbWVudDY0OTk2ODg2Ng== 1217238 2020-06-26T05:05:48Z 2020-06-26T05:05:48Z MEMBER

Dimensions on the outputs of an xarray operations are picked based on their order of appearance in the arguments.

In this case, I agree that it's somewhat surprising, but putting lon first is consistent with the order of dimensions in the function call xr.where(y.lon < 1, y, -1).

If you want to preserve the original dimensions order, one way to achieve this would be to use the where method instead, i.e., ```

y.where(y.lon < 1, -1) <xarray.DataArray 'sst' (lat: 3, lon: 3)> array([[-1., -1., -1.], [-1., -1., -1.], [-1., -1., -1.]]) Coordinates: * lat (lat) int64 0 1 2 * lon (lon) int64 10 11 12 ```

 
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