issues: 457771111

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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
457771111 MDExOlB1bGxSZXF1ZXN0Mjg5NTExOTk2 3033 ENH: keepdims=True for xarray reductions 161133 closed 0     3 2019-06-19T02:04:53Z 2019-06-23T09:18:42Z 2019-06-23T09:18:33Z CONTRIBUTOR   0 pydata/xarray/pulls/3033

Add new option keepdims to xarray reduce operations, following the behaviour of Numpy.

keepdims may be passed to reductions on either Datasets or DataArrays, and will result in the reduced dimensions being still present in the output with size 1.

Coordinates that depend on the reduced dimensions will be removed from the Dataset/DataArray

The name keepdims is used here to be consistent with Numpy, keep_dims was an alternative name proposed in #2170.

The functionality has only been added to Variable.reduce(), Dataarray.reduce() and DataSet.reduce() to start off with, it is not implemented for GroupBy, Rolling or Resample.

  • [x] Closes #2170
  • [x] Tests added
  • [x] Fully documented, including whats-new.rst for all changes and api.rst for new API
 
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