issue_comments: 438351586

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https://github.com/pydata/xarray/issues/1666#issuecomment-438351586 https://api.github.com/repos/pydata/xarray/issues/1666 438351586 MDEyOklzc3VlQ29tbWVudDQzODM1MTU4Ng== 7441788 2018-11-13T17:06:38Z 2018-11-13T17:06:38Z CONTRIBUTOR

I think there are actually a couple different ways Rolling.apply could work, but this seems like one possible way:

``` from xarray.core.utils import maybe_wrap_array from xarray.core.combine import concat

def rolling_apply(rolling, func, args, kwargs): applied = [maybe_wrap_array(label, func(arr, args, **kwargs)) for label, arr in rolling] combined = concat(applied, dim=rolling.obj.coords[rolling.dim]) return combined ```

 
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