issues: 144920646

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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
144920646 MDExOlB1bGxSZXF1ZXN0NjQ4MDEwMTc= 812 Adds cummulative operators to API 4295853 closed 0     14 2016-03-31T14:37:50Z 2016-10-03T21:06:26Z 2016-10-03T21:05:33Z CONTRIBUTOR   0 pydata/xarray/pulls/812

This PR will add cumsum and cumprod as discussed in https://github.com/pydata/xarray/issues/791 as well ensuring cumprod works for the API, resolving issues discussed at https://github.com/pydata/xarray/issues/807.

TO DO (dependencies) - [x] Add nancumprod and nancumsum to numpy (https://github.com/numpy/numpy/pull/7421) - [x] Add nancumprod and nancumsum to dask (https://github.com/dask/dask/pull/1077)

This PR extends infrastructure to support cumsum and cumprod (https://github.com/pydata/xarray/issues/791).

References: - https://github.com/numpy/numpy/pull/7421

cc @shoyer, @jhamman 

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