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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
124154674 MDU6SXNzdWUxMjQxNTQ2NzQ= 688 Keep attrs & Add a 'keep_coords' argument to Dataset.apply max-sixty 5635139 closed 0     14 2015-12-29T02:42:48Z 2023-09-30T18:47:07Z 2023-09-30T18:47:07Z MEMBER      

Generally this isn't a problem, since the coords are carried over by the resulting DataArrays:

``` python In [11]:

ds = xray.Dataset({ 'a':pd.DataFrame(pd.np.random.rand(10,3)), 'b':pd.Series(pd.np.random.rand(10)) }) ds.coords['c'] = pd.Series(pd.np.random.rand(10)) ds Out[11]: <xray.Dataset> Dimensions: (dim_0: 10, dim_1: 3) Coordinates: * dim_0 (dim_0) int64 0 1 2 3 4 5 6 7 8 9 * dim_1 (dim_1) int64 0 1 2 c (dim_0) float64 0.9318 0.2899 0.3853 0.6235 0.9436 0.7928 ... Data variables: a (dim_0, dim_1) float64 0.5707 0.9485 0.3541 0.5987 0.406 0.7992 ... b (dim_0) float64 0.4106 0.2316 0.5804 0.6393 0.5715 0.6463 ... In [12]:

ds.apply(lambda x: x*2) Out[12]: <xray.Dataset> Dimensions: (dim_0: 10, dim_1: 3) Coordinates: c (dim_0) float64 0.9318 0.2899 0.3853 0.6235 0.9436 0.7928 ... * dim_0 (dim_0) int64 0 1 2 3 4 5 6 7 8 9 * dim_1 (dim_1) int64 0 1 2 Data variables: a (dim_0, dim_1) float64 1.141 1.897 0.7081 1.197 0.812 1.598 ... b (dim_0) float64 0.8212 0.4631 1.161 1.279 1.143 1.293 0.3507 ... ```

But if there's an operation that removes the coords from the DataArrays, the coords are not there on the result (notice c below). Should the Dataset retain them? Either always or with a keep_coords argument, similar to keep_attrs.

``` python In [13]:

ds = xray.Dataset({ 'a':pd.DataFrame(pd.np.random.rand(10,3)), 'b':pd.Series(pd.np.random.rand(10)) }) ds.coords['c'] = pd.Series(pd.np.random.rand(10)) ds Out[13]: <xray.Dataset> Dimensions: (dim_0: 10, dim_1: 3) Coordinates: * dim_0 (dim_0) int64 0 1 2 3 4 5 6 7 8 9 * dim_1 (dim_1) int64 0 1 2 c (dim_0) float64 0.4121 0.2507 0.6326 0.4031 0.6169 0.441 0.1146 ... Data variables: a (dim_0, dim_1) float64 0.4813 0.2479 0.5158 0.2787 0.06672 ... b (dim_0) float64 0.2638 0.5788 0.6591 0.7174 0.3645 0.5655 ... In [14]:

ds.apply(lambda x: x.to_pandas()*2) Out[14]: <xray.Dataset> Dimensions: (dim_0: 10, dim_1: 3) Coordinates: * dim_0 (dim_0) int64 0 1 2 3 4 5 6 7 8 9 * dim_1 (dim_1) int64 0 1 2 Data variables: a (dim_0, dim_1) float64 0.9627 0.4957 1.032 0.5574 0.1334 0.8289 ... b (dim_0) float64 0.5275 1.158 1.318 1.435 0.7291 1.131 0.1903 ... ```

 
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   completed xarray 13221727 issue

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