issue_comments: 547612958

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https://github.com/pydata/xarray/issues/3461#issuecomment-547612958 https://api.github.com/repos/pydata/xarray/issues/3461 547612958 MDEyOklzc3VlQ29tbWVudDU0NzYxMjk1OA== 3274 2019-10-29T20:24:25Z 2019-10-29T20:24:25Z CONTRIBUTOR

@max-sixty I was trying to sum across the data variables, rather than across a dimension.

What I ended up doing was taking the data for each of the data variables and adding the resulting numpy arrays. This gave me the sum across the data variables, along the dim (each data variable is one dimensional and they share a single dimension).

I'm not sure how to suggest fixing the error message, because I'm not sure what xarray doesn't like.

 
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