issues: 623751213

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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
623751213 MDExOlB1bGxSZXF1ZXN0NDIyMzMzMTg0 4089 xr.cov() and xr.corr() 56925856 closed 0     20 2020-05-23T22:09:07Z 2020-05-26T18:31:31Z 2020-05-25T16:55:33Z CONTRIBUTOR   0 pydata/xarray/pulls/4089

PR for the xr.cov() and xr.corr() functionality which others have been working on. Most code adapted from @r-beer in PR #3550.

TODO: - [x] ~Write a reasonable set of tests, maybe not using pandas as a benchmark? (See https://github.com/pydata/xarray/issues/3784#issuecomment-633145887) Will probably need some help with this~

CHECKLIST: - [x] Closes #3784, #3550, #2652, #1115 - [x] Tests added - [x] Passes isort -rc . && black . && mypy . && flake8 ~(something wrong with docs though??)~ - [x] Fully documented, including whats-new.rst for all changes and api.rst for new API

 
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