issues: 342793201

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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
342793201 MDExOlB1bGxSZXF1ZXN0MjAyNjA5OTEz 2301 WIP Add a CFTimeIndex-enabled xr.cftime_range function 6628425 closed 0     9 2018-07-19T16:04:10Z 2018-09-19T20:24:51Z 2018-09-19T20:24:40Z MEMBER   0 pydata/xarray/pulls/2301
  • [x] Closes #2142
  • [x] Tests added (for all bug fixes or enhancements)
  • [x] Tests passed (for all non-documentation changes)
  • [x] Fully documented, including whats-new.rst for all changes and api.rst for new API (remove if this change should not be visible to users, e.g., if it is an internal clean-up, or if this is part of a larger project that will be documented later)

I took the approach first discussed here by @shoyer and followed pandas by creating simplified offset classes for use with cftime objects to implement a CFTimeIndex-enabled cftime_range function. I still may clean things up a bit and add a few more tests, but I wanted to post this in its current state to show some progress, as I think it is more or less working. I will try to ping folks when it is ready for a more detailed review.

Here are a few examples: ``` In [1]: import xarray as xr

In [2]: xr.cftime_range('2000-02-01', '2002-05-05', freq='3M', calendar='noleap') Out[2]: CFTimeIndex([2000-02-28 00:00:00, 2000-05-31 00:00:00, 2000-08-31 00:00:00, 2000-11-30 00:00:00, 2001-02-28 00:00:00, 2001-05-31 00:00:00, 2001-08-31 00:00:00, 2001-11-30 00:00:00, 2002-02-28 00:00:00], dtype='object')

In [3]: xr.cftime_range('2000-02-01', periods=4, freq='3A-JUN', calendar='noleap') Out[3]: CFTimeIndex([2000-06-30 00:00:00, 2003-06-30 00:00:00, 2006-06-30 00:00:00, 2009-06-30 00:00:00], dtype='object')

In [4]: xr.cftime_range(end='2000-02-01', periods=4, freq='3A-JUN') Out[4]: CFTimeIndex([1990-06-30 00:00:00, 1993-06-30 00:00:00, 1996-06-30 00:00:00, 1999-06-30 00:00:00], dtype='object') ```

Hopefully the offset classes defined here would also be useful for implementing things like resample for CFTimeIndex objects (#2191) and CFTimeIndex.shift (#2244).

 
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