issue_comments: 826364666

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https://github.com/pydata/xarray/issues/5215#issuecomment-826364666 https://api.github.com/repos/pydata/xarray/issues/5215 826364666 MDEyOklzc3VlQ29tbWVudDgyNjM2NDY2Ng== 2448579 2021-04-25T18:05:55Z 2021-04-25T18:05:55Z MEMBER

IIUC da.expanding(dim=dim).sum() is da.cumsum(dim) with support for min_periods and center like rolling.

I guess all expanding reductions are basically numpy.ufunc.accumulate(...). The dask versions will be "interesting" to write. https://github.com/dask/dask/blob/f1f37cae96d5e98f8043ea430539a4fffbe62661/dask/array/reductions.py#L1389-L1413

Like @mathause I find "expanding" confusing. .accumulate().sum() or .cumulative().sum() sounds much better to me.

 
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