issue_comments: 195446904

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https://github.com/pydata/xarray/issues/791#issuecomment-195446904 https://api.github.com/repos/pydata/xarray/issues/791 195446904 MDEyOklzc3VlQ29tbWVudDE5NTQ0NjkwNA== 1217238 2016-03-11T16:47:24Z 2016-03-11T16:47:24Z MEMBER

cumsum/cumprod will need a slightly different (simpler) interface than the other reduce methods, because unlike other aggregation functions they don't remove a dimension (the result has the same size as the input). Also, as you point out, NumPy doesn't have a nan-skipping version of these functions.

There was no particular reason why I didn't add these before -- we just never had a compelling enough need to get around to it. I don't think it would be particularly difficult.

 
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