issue_comments: 274380448

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https://github.com/pydata/xarray/issues/1224#issuecomment-274380448 https://api.github.com/repos/pydata/xarray/issues/1224 274380448 MDEyOklzc3VlQ29tbWVudDI3NDM4MDQ0OA== 6213168 2017-01-23T02:02:08Z 2017-01-23T02:02:08Z MEMBER

(arrays * weights).sum('stacked') was my first attempt. It performed considerably worse than sum(a * w for a, w in zip(arrays, weights)) - mostly because xarray.concat() is not terribly performant (I did not look deeper into it).

I did not try dask.array.sum() - worth some playing with.

 
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