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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
1046990273 PR_kwDOAMm_X84uNA5a 5950 Generate reductions for DataArray, Dataset, GroupBy and Resample dcherian 2448579 closed 0     13 2021-11-08T04:02:18Z 2022-03-18T04:17:30Z 2022-03-12T08:17:48Z MEMBER   0 pydata/xarray/pulls/5950
  • Closes #5898
  • Closes #1050
  • xref #5816

This is an improvement to #5871.

I now use classes to make the generators extensible. This allows us to generate DataArray and Dataset reductions pretty easily. It should be easy to extend to Rolling, Coarsen.

Another nice feature is that we can explicitly add custom kwargs to the signature like ddof for var and std.

 
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     xarray 13221727 pull
630062936 MDU6SXNzdWU2MzAwNjI5MzY= 4120 coarsen deletes attrs on original object dcherian 2448579 closed 0     13 2020-06-03T14:50:16Z 2020-09-09T19:30:42Z 2020-09-09T18:56:36Z MEMBER      

MCVE Code Sample

```python

Your code here

import xarray as xr

ds = xr.tutorial.load_dataset("air_temperature") ds2 = xr.tutorial.load_dataset("air_temperature")

xr.testing.assert_identical(ds, ds2) # passes ds.coarsen(lat=5).mean() xr.testing.assert_identical(ds, ds2) # fails ```

Bug: coarsen reductions are modifying the original dataset by deleting all attributes

``` AssertionErrorTraceback (most recent call last) <ipython-input-21-b0a179f01c99> in <module> 48 xr.testing.assert_identical(ds, ds2) 49 ds.coarsen(lat=5).mean() ---> 50 xr.testing.assert_identical(ds, ds2)

~/work/python/xarray/xarray/testing.py in assert_identical(a, b) 87 assert a.identical(b), formatting.diff_array_repr(a, b, "identical") 88 elif isinstance(a, (Dataset, Variable)): ---> 89 assert a.identical(b), formatting.diff_dataset_repr(a, b, "identical") 90 else: 91 raise TypeError("{} not supported by assertion comparison".format(type(a)))

AssertionError: Left and right Dataset objects are not identical

Differing coordinates: L * lat (lat) float32 75.0 72.5 70.0 67.5 65.0 ... 25.0 22.5 20.0 17.5 15.0 R * lat (lat) float32 75.0 72.5 70.0 67.5 65.0 ... 25.0 22.5 20.0 17.5 15.0 standard_name: latitude long_name: Latitude units: degrees_north axis: Y Differing data variables: L air (time, lat, lon) float32 241.2 242.5 243.5 ... 296.49 296.19 295.69 R air (time, lat, lon) float32 241.2 242.5 243.5 ... 296.49 296.19 295.69 long_name: 4xDaily Air temperature at sigma level 995 units: degK precision: 2 GRIB_id: 11 GRIB_name: TMP var_desc: Air temperature dataset: NMC Reanalysis level_desc: Surface statistic: Individual Obs parent_stat: Other actual_range: [185.16 322.1 ] ```

 
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   completed xarray 13221727 issue
282339218 MDExOlB1bGxSZXF1ZXN0MTU4NTM3MTI2 1785 plot.line(): Draw multiple lines for 2D DataArrays. dcherian 2448579 closed 0     13 2017-12-15T07:14:25Z 2018-05-10T05:12:16Z 2017-12-31T17:16:17Z MEMBER   0 pydata/xarray/pulls/1785
  • [x] Tests added (for all bug fixes or enhancements)
  • [x] Tests passed (for all non-documentation changes)
  • [x] Passes git diff upstream/master **/*py | flake8 --diff (remove if you did not edit any Python files)
  • [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)

Adds support for plotting multiple lines if plot.line() is provided with a 2D dataarray.

kwarg x lets you specify co-ordinate for x-axis.

Example:

 
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     xarray 13221727 pull

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