issue_comments: 274380660

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https://github.com/pydata/xarray/issues/1224#issuecomment-274380660 https://api.github.com/repos/pydata/xarray/issues/1224 274380660 MDEyOklzc3VlQ29tbWVudDI3NDM4MDY2MA== 1217238 2017-01-23T02:04:23Z 2017-01-23T02:04:23Z MEMBER

Was concat slow at graph construction or compute time? On Sun, Jan 22, 2017 at 6:02 PM crusaderky notifications@github.com wrote:

(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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