issues: 156591025

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id node_id number title user state locked assignee milestone comments created_at updated_at closed_at author_association active_lock_reason draft pull_request body reactions performed_via_github_app state_reason repo type
156591025 MDU6SXNzdWUxNTY1OTEwMjU= 859 BUG: Rolling on Dataset 5635139 closed 0     7 2016-05-24T19:35:32Z 2017-03-31T03:10:45Z 2017-03-31T03:10:45Z MEMBER      

This looks like it's available with dir / tab complete, but actually isn't:

``` python In [13]: xr.DataArray(np.random.rand(10,3)).to_dataset('dim_1').rolling

AttributeError Traceback (most recent call last) <ipython-input-13-438d3638a0d0> in <module>() ----> 1 xr.DataArray(np.random.rand(10,3)).to_dataset('dim_1').rolling

/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/xarray/core/common.py in getattr(self, name) 135 return source[name] 136 raise AttributeError("%r object has no attribute %r" % --> 137 (type(self).name, name)) 138 139 def setattr(self, name, value):

AttributeError: 'Dataset' object has no attribute 'rolling' ```

I think this could be easy to implement as an .apply operation? (indeed, that could be a reasonable path for a whole host of operations - i.e. try and apply them to each array in the ds?)

Also, as a very narrow point, I'm not sure why .rolling_cls is public? Probably should be private?

Finally, the Rolling implementation is pretty sweet. I've been getting my hands dirty in the pandas one recently, and that we can have something as well featured as that with so few lines of code 👍 

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